Merge branch 'prepare/1.0.0' of http://zhouxy.xyz:3000/plusone/plusone-validator into prepare/1.0.0

`BasePropertyValidator#notNull`、`CollectionPropertyValidator#notEmpty` 和 `CollectionPropertyValidator#isEmpty` 提供无参的版本

plusone-validator/pom.xml

@@ -33,12 +33,7 @@
     </dependency>
     <dependency>
       <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-api</artifactId>
-      <scope>test</scope>
-    </dependency>
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-engine</artifactId>
+      <artifactId>junit-jupiter</artifactId>
       <scope>test</scope>
     </dependency>
   </dependencies>

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BaseComparablePropertyValidator.java

@@ -21,19 +21,17 @@ import java.util.function.Supplier;
 
 import com.google.common.collect.Range;
 
-public abstract
-class BaseComparablePropertyValidator<TObj,
-                                      TProperty extends Comparable<TProperty>,
-                                      TPropertyValidator extends BaseComparablePropertyValidator<TObj, TProperty, TPropertyValidator>>
-        extends BasePropertyValidator<TObj, TProperty, TPropertyValidator> {
+public abstract class BaseComparablePropertyValidator<T, TProperty extends Comparable<TProperty>, TPropertyValidator extends BaseComparablePropertyValidator<T, TProperty, TPropertyValidator>>
+        extends BasePropertyValidator<T, TProperty, TPropertyValidator> {
 
-    BaseComparablePropertyValidator(Function<TObj, ? extends TProperty> getter) {
+    BaseComparablePropertyValidator(Function<T, ? extends TProperty> getter) {
         super(getter);
     }
 
     public TPropertyValidator inRange(Range<TProperty> range) {
         withRule(value -> value != null && range.contains(value),
-                convertExceptionCreator("The value is not in " + range.toString()));
+                value -> new IllegalArgumentException(
+                        String.format("The input must in the interval %s. You entered %s.", range, value)));
         return thisObject();
     }
 

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BasePropertyValidator.java

@@ -25,16 +25,13 @@ import java.util.function.Function;
 import java.util.function.Predicate;
 import java.util.function.Supplier;
 
-public abstract class BasePropertyValidator< //
-        TObj, //
-        TProperty, //
-        TPropertyValidator extends BasePropertyValidator<TObj, TProperty, TPropertyValidator>> {
+public abstract class BasePropertyValidator<T, TProperty, TPropertyValidator extends BasePropertyValidator<T, TProperty, TPropertyValidator>> {
 
-    private final Function<TObj, ? extends TProperty> getter;
+    private final Function<T, ? extends TProperty> getter;
 
     private final List<Consumer<? super TProperty>> consumers = new LinkedList<>();
 
-    protected BasePropertyValidator(Function<TObj, ? extends TProperty> getter) {
+    protected BasePropertyValidator(Function<T, ? extends TProperty> getter) {
         this.getter = getter;
     }
 
@@ -62,7 +59,7 @@ public abstract class BasePropertyValidator< //
         return thisObject();
     }
 
-    public final <T extends TObj> void validate(T obj) {
+    public final void validate(T obj) {
         for (Consumer<? super TProperty> consumer : consumers) {
             consumer.accept(getter.apply(obj));
         }
@@ -74,10 +71,12 @@ public abstract class BasePropertyValidator< //
     // ====== Object ======
     // ====================
 
-    // ====== notNull =====
+    // ================================
+    // #region - notNull
+    // ================================
 
     public TPropertyValidator notNull() {
-        return notNull("Value could not be null.");
+        return notNull("The input must not be null.");
     }
 
     public TPropertyValidator notNull(String errMsg) {
@@ -93,7 +92,17 @@ public abstract class BasePropertyValidator< //
         return thisObject();
     }
 
-    // ====== isNull =====
+    // ================================
+    // #endregion - notNull
+    // ================================
+
+    // ================================
+    // #region - isNull
+    // ================================
+
+    public TPropertyValidator isNull() {
+        return isNull("The input must be null.");
+    }
 
     public TPropertyValidator isNull(String errMsg) {
         return isNull(convertExceptionCreator(errMsg));
@@ -108,10 +117,17 @@ public abstract class BasePropertyValidator< //
         return thisObject();
     }
 
-    // ===== equals =====
+    // ================================
+    // #endregion - isNull
+    // ================================
+
+    // ================================
+    // #region - equals
+    // ================================
 
     public TPropertyValidator equalsThat(Object that) {
-        return equalsThat(that, value -> new IllegalArgumentException(String.format("(%s) 必须与 (%s) 相等", value, that)));
+        return equalsThat(that,
+                value -> new IllegalArgumentException(String.format("The input must be equal to '%s'.", that)));
     }
 
     public TPropertyValidator equalsThat(Object that, String errMsg) {
@@ -129,10 +145,16 @@ public abstract class BasePropertyValidator< //
         return thisObject();
     }
 
-    // ===== must =====
+    // ================================
+    // #endregion - equals
+    // ================================
+
+    // ================================
+    // #region - must
+    // ================================
 
     public TPropertyValidator must(Predicate<? super TProperty> condition) {
-        return must(condition, "无效的用户输入");
+        return must(condition, "The specified condition was not met for the input.");
     }
 
     public TPropertyValidator must(Predicate<? super TProperty> condition, String errMsg) {
@@ -152,10 +174,8 @@ public abstract class BasePropertyValidator< //
         return thisObject();
     }
 
-    // ===== must =====
-
     public TPropertyValidator must(Collection<Predicate<? super TProperty>> conditions) {
-        return must(conditions, "无效的用户输入");
+        return must(conditions, "The specified conditions were not met for the input.");
     }
 
     public TPropertyValidator must(Collection<Predicate<? super TProperty>> conditions, String errMsg) {
@@ -177,6 +197,10 @@ public abstract class BasePropertyValidator< //
         return thisObject();
     }
 
+    // ================================
+    // #endregion - must
+    // ================================
+
     static <V> Function<V, IllegalArgumentException> convertExceptionCreator(String errMsg) {
         return value -> new IllegalArgumentException(errMsg);
     }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/BoolPropertyValidator.java

@@ -19,28 +19,28 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class BoolPropertyValidator<DTO> extends BasePropertyValidator<DTO, Boolean, BoolPropertyValidator<DTO>> {
+public class BoolPropertyValidator<T> extends BasePropertyValidator<T, Boolean, BoolPropertyValidator<T>> {
 
-    BoolPropertyValidator(Function<DTO, Boolean> getter) {
+    BoolPropertyValidator(Function<T, Boolean> getter) {
         super(getter);
     }
 
     // ====== isTrueValue ======
 
-    public BoolPropertyValidator<DTO> isTrueValue() {
-        return isTrueValue("The value must be true.");
+    public BoolPropertyValidator<T> isTrueValue() {
+        return isTrueValue("The input must be true.");
     }
 
-    public BoolPropertyValidator<DTO> isTrueValue(String errMsg) {
+    public BoolPropertyValidator<T> isTrueValue(String errMsg) {
         return isTrueValue(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> BoolPropertyValidator<DTO> isTrueValue(
+    public <E extends RuntimeException> BoolPropertyValidator<T> isTrueValue(
             Supplier<E> exceptionCreator) {
         return isTrueValue(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> BoolPropertyValidator<DTO> isTrueValue(
+    public <E extends RuntimeException> BoolPropertyValidator<T> isTrueValue(
             Function<Boolean, E> exceptionCreator) {
         withRule(Boolean.TRUE::equals, exceptionCreator);
         return this;
@@ -48,27 +48,27 @@ public class BoolPropertyValidator<DTO> extends BasePropertyValidator<DTO, Boole
 
     // ====== isFalseValue ======
 
-    public BoolPropertyValidator<DTO> isFalseValue() {
-        return isFalseValue("The value must be false.");
+    public BoolPropertyValidator<T> isFalseValue() {
+        return isFalseValue("The input must be false.");
     }
 
-    public BoolPropertyValidator<DTO> isFalseValue(String errMsg) {
+    public BoolPropertyValidator<T> isFalseValue(String errMsg) {
         return isFalseValue(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> BoolPropertyValidator<DTO> isFalseValue(
+    public <E extends RuntimeException> BoolPropertyValidator<T> isFalseValue(
             Supplier<E> exceptionCreator) {
         return isFalseValue(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> BoolPropertyValidator<DTO> isFalseValue(
+    public <E extends RuntimeException> BoolPropertyValidator<T> isFalseValue(
             Function<Boolean, E> exceptionCreator) {
         withRule(Boolean.FALSE::equals, exceptionCreator);
         return this;
     }
 
     @Override
-    protected BoolPropertyValidator<DTO> thisObject() {
+    protected BoolPropertyValidator<T> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/CollectionPropertyValidator.java

@@ -22,47 +22,57 @@ import java.util.function.Supplier;
 
 import xyz.zhouxy.plusone.commons.collection.CollectionTools;
 
-public class CollectionPropertyValidator<DTO, T>
-        extends BasePropertyValidator<DTO, Collection<T>, CollectionPropertyValidator<DTO, T>> {
+public class CollectionPropertyValidator<T, TElement>
+        extends BasePropertyValidator<T, Collection<TElement>, CollectionPropertyValidator<T, TElement>> {
 
-    CollectionPropertyValidator(Function<DTO, Collection<T>> getter) {
+    CollectionPropertyValidator(Function<T, Collection<TElement>> getter) {
         super(getter);
     }
 
     // ====== notEmpty =====
 
-    public CollectionPropertyValidator<DTO, T> notEmpty(String errMsg) {
+    public CollectionPropertyValidator<T, TElement> notEmpty() {
+        return notEmpty("The input must not be empty.");
+    }
+
+    public CollectionPropertyValidator<T, TElement> notEmpty(String errMsg) {
         return notEmpty(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> CollectionPropertyValidator<DTO, T> notEmpty(Supplier<E> exceptionCreator) {
+    public <E extends RuntimeException> CollectionPropertyValidator<T, TElement> notEmpty(
+            Supplier<E> exceptionCreator) {
         return notEmpty(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> CollectionPropertyValidator<DTO, T> notEmpty(
-            Function<Collection<T>, E> exceptionCreator) {
+    public <E extends RuntimeException> CollectionPropertyValidator<T, TElement> notEmpty(
+            Function<Collection<TElement>, E> exceptionCreator) {
         withRule(CollectionTools::isNotEmpty, exceptionCreator);
         return this;
     }
 
     // ====== isEmpty =====
 
-    public CollectionPropertyValidator<DTO, T> isEmpty(String errMsg) {
+    public CollectionPropertyValidator<T, TElement> isEmpty() {
+        return isEmpty("The input must be empty.");
+    }
+
+    public CollectionPropertyValidator<T, TElement> isEmpty(String errMsg) {
         return isEmpty(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> CollectionPropertyValidator<DTO, T> isEmpty(Supplier<E> exceptionCreator) {
+    public <E extends RuntimeException> CollectionPropertyValidator<T, TElement> isEmpty(
+            Supplier<E> exceptionCreator) {
         return isEmpty(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> CollectionPropertyValidator<DTO, T> isEmpty(
-            Function<Collection<T>, E> exceptionCreator) {
+    public <E extends RuntimeException> CollectionPropertyValidator<T, TElement> isEmpty(
+            Function<Collection<TElement>, E> exceptionCreator) {
         withRule(CollectionTools::isEmpty, exceptionCreator);
         return this;
     }
 
     @Override
-    protected CollectionPropertyValidator<DTO, T> thisObject() {
+    protected CollectionPropertyValidator<T, TElement> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ComparablePropertyValidator.java

@@ -18,15 +18,15 @@ package xyz.zhouxy.plusone.validator;
 
 import java.util.function.Function;
 
-public class ComparablePropertyValidator<TObj, TProperty extends Comparable<TProperty>>
-        extends BaseComparablePropertyValidator<TObj, TProperty, ComparablePropertyValidator<TObj, TProperty>> {
+public class ComparablePropertyValidator<T, TProperty extends Comparable<TProperty>>
+        extends BaseComparablePropertyValidator<T, TProperty, ComparablePropertyValidator<T, TProperty>> {
 
-    ComparablePropertyValidator(Function<TObj, ? extends TProperty> getter) {
+    ComparablePropertyValidator(Function<T, ? extends TProperty> getter) {
         super(getter);
     }
 
     @Override
-    protected ComparablePropertyValidator<TObj, TProperty> thisObject() {
+    protected ComparablePropertyValidator<T, TProperty> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/DoublePropertyValidator.java

@@ -19,10 +19,10 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class DoublePropertyValidator<DTO>
-        extends BaseComparablePropertyValidator<DTO, Double, DoublePropertyValidator<DTO>> {
+public class DoublePropertyValidator<T>
+        extends BaseComparablePropertyValidator<T, Double, DoublePropertyValidator<T>> {
 
-    DoublePropertyValidator(Function<DTO, Double> getter) {
+    DoublePropertyValidator(Function<T, Double> getter) {
         super(getter);
     }
 
@@ -30,20 +30,21 @@ public class DoublePropertyValidator<DTO>
     // #region - greater than
     // ================================
 
-    public DoublePropertyValidator<DTO> gt(double min) {
-        return gt(min, String.format("The value should be greater than %s", min));
+    public DoublePropertyValidator<T> gt(double min) {
+        return gt(min, () -> new IllegalArgumentException(
+                String.format("The input must be greater than '%s'.", min)));
     }
 
-    public DoublePropertyValidator<DTO> gt(double min, String errMsg) {
+    public DoublePropertyValidator<T> gt(double min, String errMsg) {
         return gt(min, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> gt(
+    public <E extends RuntimeException> DoublePropertyValidator<T> gt(
             double min, Supplier<E> exceptionCreator) {
         return gt(min, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> gt(
+    public <E extends RuntimeException> DoublePropertyValidator<T> gt(
             double min, Function<Double, E> exceptionCreator) {
         withRule(value -> (value != null && value > min), exceptionCreator);
         return this;
@@ -57,20 +58,21 @@ public class DoublePropertyValidator<DTO>
     // #region - greater than or equal to
     // ================================
 
-    public DoublePropertyValidator<DTO> ge(double min) {
-        return ge(min, String.format("The value should be greater than or equal to %s", min));
+    public DoublePropertyValidator<T> ge(double min) {
+        return ge(min, () -> new IllegalArgumentException(
+                String.format("The input must be greater than or equal to '%s'.", min)));
     }
 
-    public DoublePropertyValidator<DTO> ge(double min, String errMsg) {
+    public DoublePropertyValidator<T> ge(double min, String errMsg) {
         return ge(min, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> ge(
+    public <E extends RuntimeException> DoublePropertyValidator<T> ge(
             double min, Supplier<E> exceptionCreator) {
         return ge(min, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> ge(
+    public <E extends RuntimeException> DoublePropertyValidator<T> ge(
             double min, Function<Double, E> exceptionCreator) {
         withRule(value -> (value != null && value >= min), exceptionCreator);
         return this;
@@ -84,20 +86,21 @@ public class DoublePropertyValidator<DTO>
     // #region - less than
     // ================================
 
-    public DoublePropertyValidator<DTO> lt(double max) {
-        return lt(max, String.format("The value should be less than %s", max));
+    public DoublePropertyValidator<T> lt(double max) {
+        return lt(max, () -> new IllegalArgumentException(
+                String.format("The input must be less than '%s'.", max)));
     }
 
-    public DoublePropertyValidator<DTO> lt(double max, String errMsg) {
+    public DoublePropertyValidator<T> lt(double max, String errMsg) {
         return lt(max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> lt(
+    public <E extends RuntimeException> DoublePropertyValidator<T> lt(
             double max, Supplier<E> exceptionCreator) {
         return lt(max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> lt(
+    public <E extends RuntimeException> DoublePropertyValidator<T> lt(
             double max, Function<Double, E> exceptionCreator) {
         withRule(value -> (value != null && value < max), exceptionCreator);
         return this;
@@ -111,20 +114,21 @@ public class DoublePropertyValidator<DTO>
     // #region - less than or equal to
     // ================================
 
-    public DoublePropertyValidator<DTO> le(double max) {
-        return le(max, String.format("The value should be less than or equal to %s", max));
+    public DoublePropertyValidator<T> le(double max) {
+        return le(max, () -> new IllegalArgumentException(
+                String.format("The input must be less than or equal to '%s'.", max)));
     }
 
-    public DoublePropertyValidator<DTO> le(double max, String errMsg) {
+    public DoublePropertyValidator<T> le(double max, String errMsg) {
         return le(max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> le(
+    public <E extends RuntimeException> DoublePropertyValidator<T> le(
             double max, Supplier<E> exceptionCreator) {
         return le(max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> DoublePropertyValidator<DTO> le(
+    public <E extends RuntimeException> DoublePropertyValidator<T> le(
             double max, Function<Double, E> exceptionCreator) {
         withRule(value -> (value != null && value <= max), exceptionCreator);
         return this;
@@ -135,7 +139,7 @@ public class DoublePropertyValidator<DTO>
     // ================================
 
     @Override
-    protected DoublePropertyValidator<DTO> thisObject() {
+    protected DoublePropertyValidator<T> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/IntPropertyValidator.java

@@ -19,10 +19,10 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class IntPropertyValidator<DTO>
-        extends BaseComparablePropertyValidator<DTO, Integer, IntPropertyValidator<DTO>> {
+public class IntPropertyValidator<T>
+        extends BaseComparablePropertyValidator<T, Integer, IntPropertyValidator<T>> {
 
-    IntPropertyValidator(Function<DTO, Integer> getter) {
+    IntPropertyValidator(Function<T, Integer> getter) {
         super(getter);
     }
 
@@ -30,20 +30,21 @@ public class IntPropertyValidator<DTO>
     // #region - greater than
     // ================================
 
-    public IntPropertyValidator<DTO> gt(int min) {
-        return gt(min, String.format("The value should be greater than %d", min));
+    public IntPropertyValidator<T> gt(int min) {
+        return gt(min, () -> new IllegalArgumentException(
+                String.format("The input must be greater than '%d'.", min)));
     }
 
-    public IntPropertyValidator<DTO> gt(int min, String errMsg) {
+    public IntPropertyValidator<T> gt(int min, String errMsg) {
         return gt(min, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> gt(
+    public <E extends RuntimeException> IntPropertyValidator<T> gt(
             int min, Supplier<E> exceptionCreator) {
         return gt(min, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> gt(
+    public <E extends RuntimeException> IntPropertyValidator<T> gt(
             int min, Function<Integer, E> exceptionCreator) {
         withRule(value -> (value != null && value > min), exceptionCreator);
         return this;
@@ -57,20 +58,21 @@ public class IntPropertyValidator<DTO>
     // #region - greater than or equal to
     // ================================
 
-    public IntPropertyValidator<DTO> ge(int min) {
-        return ge(min, String.format("The value should be greater than or equal to %d", min));
+    public IntPropertyValidator<T> ge(int min) {
+        return ge(min, () -> new IllegalArgumentException(
+                String.format("The input must be greater than or equal to '%d'.", min)));
     }
 
-    public IntPropertyValidator<DTO> ge(int min, String errMsg) {
+    public IntPropertyValidator<T> ge(int min, String errMsg) {
         return ge(min, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> ge(
+    public <E extends RuntimeException> IntPropertyValidator<T> ge(
             int min, Supplier<E> exceptionCreator) {
         return ge(min, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> ge(
+    public <E extends RuntimeException> IntPropertyValidator<T> ge(
             int min, Function<Integer, E> exceptionCreator) {
         withRule(value -> (value != null && value >= min), exceptionCreator);
         return this;
@@ -84,20 +86,21 @@ public class IntPropertyValidator<DTO>
     // #region - less than
     // ================================
 
-    public IntPropertyValidator<DTO> lt(int max) {
-        return lt(max, String.format("The value should be less than %d", max));
+    public IntPropertyValidator<T> lt(int max) {
+        return lt(max, () -> new IllegalArgumentException(
+                String.format("The input must be less than '%d'.", max)));
     }
 
-    public IntPropertyValidator<DTO> lt(int max, String errMsg) {
+    public IntPropertyValidator<T> lt(int max, String errMsg) {
         return lt(max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> lt(
+    public <E extends RuntimeException> IntPropertyValidator<T> lt(
             int max, Supplier<E> exceptionCreator) {
         return lt(max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> lt(
+    public <E extends RuntimeException> IntPropertyValidator<T> lt(
             int max, Function<Integer, E> exceptionCreator) {
         withRule(value -> (value != null && value < max), exceptionCreator);
         return this;
@@ -111,20 +114,21 @@ public class IntPropertyValidator<DTO>
     // #region - less than or equal to
     // ================================
 
-    public IntPropertyValidator<DTO> le(int max) {
-        return le(max, String.format("The value should be less than or equal to %d", max));
+    public IntPropertyValidator<T> le(int max) {
+        return le(max, () -> new IllegalArgumentException(
+                String.format("The input must be less than or equal to '%d'.", max)));
     }
 
-    public IntPropertyValidator<DTO> le(int max, String errMsg) {
+    public IntPropertyValidator<T> le(int max, String errMsg) {
         return le(max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> le(
+    public <E extends RuntimeException> IntPropertyValidator<T> le(
             int max, Supplier<E> exceptionCreator) {
         return le(max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> IntPropertyValidator<DTO> le(
+    public <E extends RuntimeException> IntPropertyValidator<T> le(
             int max, Function<Integer, E> exceptionCreator) {
         withRule(value -> (value != null && value <= max), exceptionCreator);
         return this;
@@ -135,7 +139,7 @@ public class IntPropertyValidator<DTO>
     // ================================
 
     @Override
-    protected IntPropertyValidator<DTO> thisObject() {
+    protected IntPropertyValidator<T> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/LongPropertyValidator.java

@@ -19,10 +19,10 @@ package xyz.zhouxy.plusone.validator;
 import java.util.function.Function;
 import java.util.function.Supplier;
 
-public class LongPropertyValidator<DTO>
-        extends BaseComparablePropertyValidator<DTO, Long, LongPropertyValidator<DTO>> {
+public class LongPropertyValidator<T>
+        extends BaseComparablePropertyValidator<T, Long, LongPropertyValidator<T>> {
 
-    LongPropertyValidator(Function<DTO, Long> getter) {
+    LongPropertyValidator(Function<T, Long> getter) {
         super(getter);
     }
 
@@ -30,20 +30,21 @@ public class LongPropertyValidator<DTO>
     // #region - greater than
     // ================================
 
-    public LongPropertyValidator<DTO> gt(long min) {
-        return gt(min, String.format("The value should be greater than %d", min));
+    public LongPropertyValidator<T> gt(long min) {
+        return gt(min, () -> new IllegalArgumentException(
+                String.format("The input must be greater than '%d'.", min)));
     }
 
-    public LongPropertyValidator<DTO> gt(long min, String errMsg) {
+    public LongPropertyValidator<T> gt(long min, String errMsg) {
         return gt(min, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> gt(
+    public <E extends RuntimeException> LongPropertyValidator<T> gt(
             long min, Supplier<E> exceptionCreator) {
         return gt(min, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> gt(
+    public <E extends RuntimeException> LongPropertyValidator<T> gt(
             long min, Function<Long, E> exceptionCreator) {
         withRule(value -> (value != null && value > min), exceptionCreator);
         return this;
@@ -57,20 +58,21 @@ public class LongPropertyValidator<DTO>
     // #region - greater than or equal to
     // ================================
 
-    public LongPropertyValidator<DTO> ge(long min) {
-        return ge(min, String.format("The value should be greater than or equal to %d", min));
+    public LongPropertyValidator<T> ge(long min) {
+        return ge(min, () -> new IllegalArgumentException(
+                String.format("The input must be greater than or equal to '%d'.", min)));
     }
 
-    public LongPropertyValidator<DTO> ge(long min, String errMsg) {
+    public LongPropertyValidator<T> ge(long min, String errMsg) {
         return ge(min, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> ge(
+    public <E extends RuntimeException> LongPropertyValidator<T> ge(
             long min, Supplier<E> exceptionCreator) {
         return ge(min, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> ge(
+    public <E extends RuntimeException> LongPropertyValidator<T> ge(
             long min, Function<Long, E> exceptionCreator) {
         withRule(value -> (value != null && value >= min), exceptionCreator);
         return this;
@@ -84,20 +86,21 @@ public class LongPropertyValidator<DTO>
     // #region - less than
     // ================================
 
-    public LongPropertyValidator<DTO> lt(long max) {
-        return lt(max, String.format("The value should be less than %d", max));
+    public LongPropertyValidator<T> lt(long max) {
+        return lt(max, () -> new IllegalArgumentException(
+                String.format("The input must be less than '%d'.", max)));
     }
 
-    public LongPropertyValidator<DTO> lt(long max, String errMsg) {
+    public LongPropertyValidator<T> lt(long max, String errMsg) {
         return lt(max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> lt(
+    public <E extends RuntimeException> LongPropertyValidator<T> lt(
             long max, Supplier<E> exceptionCreator) {
         return lt(max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> lt(
+    public <E extends RuntimeException> LongPropertyValidator<T> lt(
             long max, Function<Long, E> exceptionCreator) {
         withRule(value -> (value != null && value < max), exceptionCreator);
         return this;
@@ -111,20 +114,21 @@ public class LongPropertyValidator<DTO>
     // #region - less than or equal to
     // ================================
 
-    public LongPropertyValidator<DTO> le(long max) {
-        return le(max, String.format("The value should be less than or equal to %d", max));
+    public LongPropertyValidator<T> le(long max) {
+        return le(max, () -> new IllegalArgumentException(
+                String.format("The input must be less than or equal to '%d'.", max)));
     }
 
-    public LongPropertyValidator<DTO> le(long max, String errMsg) {
+    public LongPropertyValidator<T> le(long max, String errMsg) {
         return le(max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> le(
+    public <E extends RuntimeException> LongPropertyValidator<T> le(
             long max, Supplier<E> exceptionCreator) {
         return le(max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> LongPropertyValidator<DTO> le(
+    public <E extends RuntimeException> LongPropertyValidator<T> le(
             long max, Function<Long, E> exceptionCreator) {
         withRule(value -> (value != null && value <= max), exceptionCreator);
         return this;
@@ -135,7 +139,7 @@ public class LongPropertyValidator<DTO>
     // ================================
 
     @Override
-    protected LongPropertyValidator<DTO> thisObject() {
+    protected LongPropertyValidator<T> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ObjectPropertyValidator.java

@@ -18,14 +18,15 @@ package xyz.zhouxy.plusone.validator;
 
 import java.util.function.Function;
 
-public class ObjectPropertyValidator<DTO, T> extends BasePropertyValidator<DTO, T, ObjectPropertyValidator<DTO, T>> {
+public class ObjectPropertyValidator<T, TProperty>
+        extends BasePropertyValidator<T, TProperty, ObjectPropertyValidator<T, TProperty>> {
 
-    ObjectPropertyValidator(Function<DTO, T> getter) {
+    ObjectPropertyValidator(Function<T, TProperty> getter) {
         super(getter);
     }
 
     @Override
-    protected ObjectPropertyValidator<DTO, T> thisObject() {
+    protected ObjectPropertyValidator<T, TProperty> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/StringPropertyValidator.java

@@ -22,8 +22,6 @@ import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.regex.Pattern;
 
-import com.google.common.base.Strings;
-
 import xyz.zhouxy.plusone.commons.constant.PatternConsts;
 import xyz.zhouxy.plusone.commons.util.AssertTools;
 import xyz.zhouxy.plusone.commons.util.RegexTools;
@@ -38,9 +36,9 @@ import xyz.zhouxy.plusone.commons.util.StringTools;
  *
  * @author <a href="http://zhouxy.xyz:3000/ZhouXY108">ZhouXY</a>
  */
-public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidator<DTO, String, StringPropertyValidator<DTO>> {
+public class StringPropertyValidator<T> extends BaseComparablePropertyValidator<T, String, StringPropertyValidator<T>> {
 
-    StringPropertyValidator(Function<DTO, String> getter) {
+    StringPropertyValidator(Function<T, String> getter) {
         super(getter);
     }
 
@@ -48,20 +46,20 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #region - matches
     // ================================
 
-    public StringPropertyValidator<DTO> matches(Pattern regex, String errMsg) {
+    public StringPropertyValidator<T> matches(Pattern regex, String errMsg) {
         return matches(regex, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matches(
+    public <E extends RuntimeException> StringPropertyValidator<T> matches(
             Pattern regex,
             Supplier<E> exceptionCreator) {
         return matches(regex, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matches(
+    public <E extends RuntimeException> StringPropertyValidator<T> matches(
             Pattern regex,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexTools.matches(input, regex), exceptionCreator);
+        withRule(input -> (input == null || RegexTools.matches(input, regex)), exceptionCreator);
         return this;
     }
 
@@ -73,37 +71,37 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #region - matchesOne
     // ================================
 
-    public StringPropertyValidator<DTO> matchesOne(Pattern[] regexs, String errMsg) {
+    public StringPropertyValidator<T> matchesOne(Pattern[] regexs, String errMsg) {
         return matchesOne(regexs, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesOne(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesOne(
             Pattern[] regexs,
             Supplier<E> exceptionCreator) {
         return matchesOne(regexs, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesOne(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesOne(
             Pattern[] regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexTools.matchesOne(input, regexs), exceptionCreator);
+        withRule(input -> input == null || RegexTools.matchesOne(input, regexs), exceptionCreator);
         return this;
     }
 
-    public StringPropertyValidator<DTO> matchesOne(List<Pattern> regexs, String errMsg) {
+    public StringPropertyValidator<T> matchesOne(List<Pattern> regexs, String errMsg) {
         return matchesOne(regexs, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesOne(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesOne(
             List<Pattern> regexs,
             Supplier<E> exceptionCreator) {
         return matchesOne(regexs, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesOne(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesOne(
             List<Pattern> regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexTools.matchesOne(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
+        withRule(input -> input == null || RegexTools.matchesOne(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
         return this;
     }
 
@@ -115,37 +113,37 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #region - matchesAll
     // ================================
 
-    public StringPropertyValidator<DTO> matchesAll(Pattern[] regexs, String errMsg) {
+    public StringPropertyValidator<T> matchesAll(Pattern[] regexs, String errMsg) {
         return matchesAll(regexs, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesAll(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesAll(
             Pattern[] regexs,
             Supplier<E> exceptionCreator) {
         return matchesAll(regexs, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesAll(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesAll(
             Pattern[] regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexTools.matchesAll(input, regexs), exceptionCreator);
+        withRule(input -> input == null || RegexTools.matchesAll(input, regexs), exceptionCreator);
         return this;
     }
 
-    public StringPropertyValidator<DTO> matchesAll(Collection<Pattern> regexs, String errMsg) {
+    public StringPropertyValidator<T> matchesAll(Collection<Pattern> regexs, String errMsg) {
         return matchesAll(regexs, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesAll(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesAll(
             Collection<Pattern> regexs,
             Supplier<E> exceptionCreator) {
         return matchesAll(regexs, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> matchesAll(
+    public <E extends RuntimeException> StringPropertyValidator<T> matchesAll(
             Collection<Pattern> regexs,
             Function<String, E> exceptionCreator) {
-        withRule(input -> RegexTools.matchesAll(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
+        withRule(input -> input == null || RegexTools.matchesAll(input, regexs.toArray(new Pattern[regexs.size()])), exceptionCreator);
         return this;
     }
 
@@ -157,19 +155,19 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #region - notBlank
     // ================================
 
-    public StringPropertyValidator<DTO> notBlank() {
-        return notBlank("This String argument must have text; it must not be null, empty, or blank");
+    public StringPropertyValidator<T> notBlank() {
+        return notBlank("The input must not be blank.");
     }
 
-    public StringPropertyValidator<DTO> notBlank(String errMsg) {
+    public StringPropertyValidator<T> notBlank(String errMsg) {
         return notBlank(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> notBlank(Supplier<E> exceptionCreator) {
+    public <E extends RuntimeException> StringPropertyValidator<T> notBlank(Supplier<E> exceptionCreator) {
         return notBlank(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> notBlank(
+    public <E extends RuntimeException> StringPropertyValidator<T> notBlank(
             Function<String, E> exceptionCreator) {
         withRule(StringTools::isNotBlank, exceptionCreator);
         return this;
@@ -183,20 +181,20 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #region - emailAddress
     // ================================
 
-    public StringPropertyValidator<DTO> emailAddress() {
-        return emailAddress("The value is not an email address.");
+    public StringPropertyValidator<T> emailAddress() {
+        return emailAddress("The input is not a valid email address.");
     }
 
-    public StringPropertyValidator<DTO> emailAddress(String errMsg) {
+    public StringPropertyValidator<T> emailAddress(String errMsg) {
         return emailAddress(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> emailAddress(
+    public <E extends RuntimeException> StringPropertyValidator<T> emailAddress(
             Supplier<E> exceptionCreator) {
         return emailAddress(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> emailAddress(
+    public <E extends RuntimeException> StringPropertyValidator<T> emailAddress(
             Function<String, E> exceptionCreator) {
         return matches(PatternConsts.EMAIL, exceptionCreator);
     }
@@ -209,15 +207,19 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #region - notEmpty
     // ================================
 
-    public StringPropertyValidator<DTO> notEmpty(String errMsg) {
+    public StringPropertyValidator<T> notEmpty() {
+        return notEmpty("The input must not be empty.");
+    }
+
+    public StringPropertyValidator<T> notEmpty(String errMsg) {
         return notEmpty(convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> notEmpty(Supplier<E> exceptionCreator) {
+    public <E extends RuntimeException> StringPropertyValidator<T> notEmpty(Supplier<E> exceptionCreator) {
         return notEmpty(convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> notEmpty(
+    public <E extends RuntimeException> StringPropertyValidator<T> notEmpty(
             Function<String, E> exceptionCreator) {
         withRule(s -> s != null && !s.isEmpty(), exceptionCreator);
         return this;
@@ -227,70 +229,48 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // #endregion - notEmpty
     // ================================
 
-    // ================================
-    // #region - isNullOrEmpty
-    // ================================
-
-    public StringPropertyValidator<DTO> isNullOrEmpty(String errMsg) {
-        return isNullOrEmpty(convertExceptionCreator(errMsg));
-    }
-
-    public <E extends RuntimeException> StringPropertyValidator<DTO> isNullOrEmpty(Supplier<E> exceptionCreator) {
-        return isNullOrEmpty(convertExceptionCreator(exceptionCreator));
-    }
-
-    public <E extends RuntimeException> StringPropertyValidator<DTO> isNullOrEmpty(
-            Function<String, E> exceptionCreator) {
-        withRule(Strings::isNullOrEmpty, exceptionCreator);
-        return this;
-    }
-
-    // ================================
-    // #endregion - isNullOrEmpty
-    // ================================
-
     // ================================
     // #region - length
     // ================================
 
-    public StringPropertyValidator<DTO> length(int length, String errMsg) {
+    public StringPropertyValidator<T> length(int length, String errMsg) {
         return length(length, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> length(int length,
+    public <E extends RuntimeException> StringPropertyValidator<T> length(int length,
             Supplier<E> exceptionCreator) {
         return length(length, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> length(int length,
+    public <E extends RuntimeException> StringPropertyValidator<T> length(int length,
             Function<String, E> exceptionCreator) {
         AssertTools.checkArgument(length >= 0,
-                "The required length must be greater than or equal to 0.");
-        withRule(s -> s != null && s.length() == length, exceptionCreator);
+                "The expected length must be greater than or equal to 0.");
+        withRule(s -> s == null || s.length() == length, exceptionCreator);
         return this;
     }
 
     static boolean length(String str, int min, int max) {
         if (str == null) {
-            return false;
+            return true;
         }
         final int len = str.length();
-        return len >= min && len < max;
+        return len >= min && len <= max;
     }
 
-    public StringPropertyValidator<DTO> length(int min, int max, String errMsg) {
+    public StringPropertyValidator<T> length(int min, int max, String errMsg) {
         return length(min, max, convertExceptionCreator(errMsg));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> length(int min, int max,
+    public <E extends RuntimeException> StringPropertyValidator<T> length(int min, int max,
             Supplier<E> exceptionCreator) {
         return length(min, max, convertExceptionCreator(exceptionCreator));
     }
 
-    public <E extends RuntimeException> StringPropertyValidator<DTO> length(int min, int max,
+    public <E extends RuntimeException> StringPropertyValidator<T> length(int min, int max,
             Function<String, E> exceptionCreator) {
-        AssertTools.checkArgument(min >= 0, "The minimum value must be greater than equal to 0.");
-        AssertTools.checkArgument(min < max, "The minimum value must be less than the maximum value.");
+        AssertTools.checkArgument(min >= 0, "The 'min' must be greater than or equal to 0.");
+        AssertTools.checkArgument(min <= max, "The 'min' must be less than or equal to the 'max'.");
         withRule(s -> length(s, min, max), exceptionCreator);
         return this;
     }
@@ -300,7 +280,7 @@ public class StringPropertyValidator<DTO> extends BaseComparablePropertyValidato
     // ================================
 
     @Override
-    protected StringPropertyValidator<DTO> thisObject() {
+    protected StringPropertyValidator<T> thisObject() {
         return this;
     }
 }

plusone-validator/src/main/java/xyz/zhouxy/plusone/validator/ValidTools.java

@@ -1,45 +0,0 @@
-/*
- * Copyright 2022-2025 the original author or authors.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package xyz.zhouxy.plusone.validator;
-
-/**
- * 校验工具类
- * <p>
- * 对 {@link IValidateRequired} 的实现类对象进行校验
- * </p>
- *
- * @author <a href="https://gitee.com/zhouxy108">ZhouXY</a>
- *
- * @see BaseValidator
- * @see Validator
- * @see IValidateRequired
- */
-public class ValidTools {
-    private ValidTools() {
-        throw new IllegalStateException("Utility class");
-    }
-
-    public static void validate(Object obj) {
-        if (obj instanceof IValidateRequired) {
-            ((IValidateRequired) obj).validate();
-        }
-    }
-
-    public static <T> void validate(T obj, BaseValidator<T> validator) {
-        validator.validate(obj);
-    }
-}

plusone-validator/src/test/java/xyz/zhouxy/plusone/ExampleException.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone;
+
+import xyz.zhouxy.plusone.commons.annotation.StaticFactoryMethod;
+
+public class ExampleException extends RuntimeException {
+
+    private ExampleException(String message) {
+        super(message);
+    }
+
+    @StaticFactoryMethod
+    public static ExampleException withMessage(String message) {
+        return new ExampleException(message);
+    }
+
+    @StaticFactoryMethod
+    public static ExampleException withMessage(String format, Object... args) {
+        return new ExampleException(String.format(format, args));
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/ExampleCommand.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone.example;
+
+import java.time.LocalDateTime;
+import java.util.List;
+
+/**
+ * 接口入参的 DTO 示例
+ */
+public class ExampleCommand {
+    private Boolean boolProperty;
+    private Integer intProperty;
+    private Long longProperty;
+    private Double doubleProperty;
+    private String stringProperty;
+    private LocalDateTime dateTimeProperty;
+    private Foo objectProperty;
+    private List<String> stringListProperty;
+
+    public ExampleCommand() {
+    }
+
+    public ExampleCommand(Boolean boolProperty, Integer intProperty, Long longProperty, Double doubleProperty,
+            String stringProperty, LocalDateTime dateTimeProperty, Foo objectProperty,
+            List<String> stringListProperty) {
+        this.boolProperty = boolProperty;
+        this.intProperty = intProperty;
+        this.longProperty = longProperty;
+        this.doubleProperty = doubleProperty;
+        this.stringProperty = stringProperty;
+        this.dateTimeProperty = dateTimeProperty;
+        this.objectProperty = objectProperty;
+        this.stringListProperty = stringListProperty;
+    }
+
+    public Boolean getBoolProperty() {
+        return boolProperty;
+    }
+
+    public void setBoolProperty(Boolean boolProperty) {
+        this.boolProperty = boolProperty;
+    }
+
+    public Integer getIntProperty() {
+        return intProperty;
+    }
+
+    public void setIntProperty(Integer intProperty) {
+        this.intProperty = intProperty;
+    }
+
+    public Long getLongProperty() {
+        return longProperty;
+    }
+
+    public void setLongProperty(Long longProperty) {
+        this.longProperty = longProperty;
+    }
+
+    public Double getDoubleProperty() {
+        return doubleProperty;
+    }
+
+    public void setDoubleProperty(Double doubleProperty) {
+        this.doubleProperty = doubleProperty;
+    }
+
+    public String getStringProperty() {
+        return stringProperty;
+    }
+
+    public void setStringProperty(String stringProperty) {
+        this.stringProperty = stringProperty;
+    }
+
+    public LocalDateTime getDateTimeProperty() {
+        return dateTimeProperty;
+    }
+
+    public void setDateTimeProperty(LocalDateTime dateTimeProperty) {
+        this.dateTimeProperty = dateTimeProperty;
+    }
+
+    public Foo getObjectProperty() {
+        return objectProperty;
+    }
+
+    public void setObjectProperty(Foo objectProperty) {
+        this.objectProperty = objectProperty;
+    }
+
+    public List<String> getStringListProperty() {
+        return stringListProperty;
+    }
+
+    public void setStringListProperty(List<String> stringListProperty) {
+        this.stringListProperty = stringListProperty;
+    }
+
+    @Override
+    public String toString() {
+        return "ExampleCommand [boolProperty=" + boolProperty + ", intProperty=" + intProperty + ", longProperty="
+                + longProperty + ", doubleProperty=" + doubleProperty + ", stringProperty=" + stringProperty
+                + ", dateTimeProperty=" + dateTimeProperty + ", objectProperty=" + objectProperty
+                + ", stringListProperty=" + stringListProperty + "]";
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/Foo.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone.example;
+
+import java.util.Objects;
+
+public class Foo {
+    private Integer intProperty;
+    private String stringProperty;
+
+    public Foo() {
+    }
+
+    public Foo(Integer intProperty, String stringProperty) {
+        this.intProperty = intProperty;
+        this.stringProperty = stringProperty;
+    }
+
+    public Integer getIntProperty() {
+        return intProperty;
+    }
+
+    public void setIntProperty(Integer intProperty) {
+        this.intProperty = intProperty;
+    }
+
+    public String getStringProperty() {
+        return stringProperty;
+    }
+
+    public void setStringProperty(String stringProperty) {
+        this.stringProperty = stringProperty;
+    }
+
+    @Override
+    public String toString() {
+        return "Foo [intProperty=" + intProperty + ", stringProperty=" + stringProperty + "]";
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(intProperty, stringProperty);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (!(obj instanceof Foo))
+            return false;
+        Foo other = (Foo) obj;
+        return Objects.equals(intProperty, other.intProperty) && Objects.equals(stringProperty, other.stringProperty);
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/BaseValidatorTest.java

@@ -0,0 +1,88 @@
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.Objects;
+
+import org.junit.jupiter.api.Test;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+class BaseValidatorTest {
+
+    @Test
+    void withRule_validInput() {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setStringProperty("Foo");
+
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                withRule(command -> Objects.equals(command.getStringProperty(), "Foo"),
+                        "The stringProperty must be equal to 'Foo'");
+                withRule(command -> Objects.equals(command.getStringProperty(), "Foo"),
+                        () -> ExampleException.withMessage("The stringProperty must be equal to 'Foo'"));
+                withRule(command -> Objects.equals(command.getStringProperty(), "Foo"),
+                        str -> ExampleException.withMessage("The stringProperty must be equal to 'Foo', but is was '%s'.", str));
+                withRule(command -> {
+                    final String stringProperty = command.getStringProperty();
+                    if (!Objects.equals(stringProperty, "Foo")) {
+                        throw ExampleException.withMessage("");
+                    }
+                });
+            }
+        };
+        assertDoesNotThrow(() -> validator.validate(exampleCommand));
+    }
+
+    @Test
+    void withRule_invalidInput() {
+        ExampleCommand command = new ExampleCommand();
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                withRule(command -> Objects.equals(command.getStringProperty(), "Foo"),
+                        "The stringProperty must be equal to 'Foo'");
+            }
+        };
+        IllegalArgumentException eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo'", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                withRule(command -> Objects.equals(command.getStringProperty(), "Foo"),
+                        () -> ExampleException.withMessage("The stringProperty must be equal to 'Foo'"));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class,
+                () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo'", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                withRule(command -> Objects.equals(command.getStringProperty(), "Foo"), command -> ExampleException
+                        .withMessage("The stringProperty must be equal to 'Foo', but is was '%s'.", command.getStringProperty()));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class,
+                () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo', but is was 'null'.", specifiedException2.getMessage());
+
+        BaseValidator<ExampleCommand> rule = new BaseValidator<ExampleCommand>() {
+            {
+                withRule(command -> {
+                    final String stringProperty = command.getStringProperty();
+                    if (!Objects.equals(stringProperty, "Foo")) {
+                        throw ExampleException.withMessage("");
+                    }
+                });
+            }
+        };
+        ExampleException e = assertThrows(ExampleException.class, () -> rule.validate(command));
+        assertEquals("", e.getMessage());
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/BoolPropertyValidatorTests.java

@@ -0,0 +1,385 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class BoolPropertyValidatorTests {
+
+    // ================================
+    // #region - isTrueValue
+    // ================================
+
+    @Test
+    void isTrueValue_trueProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty).isTrueValue();
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue("The boolProperty should be true.");
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(() -> ExampleException.withMessage("The boolProperty should be true."));
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(property -> ExampleException.withMessage(
+                                "The boolProperty should be true, but it is `%s`", property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(true);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void isTrueValue_default_falseProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty).isTrueValue();
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(false);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The input must be true.", exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_message_falseProperty() {
+        final String message = "The boolProperty should be true.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(message);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(false);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_exceptionSupplier_falseProperty() {
+        final String message = "The boolProperty should be true.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(() -> ExampleException.withMessage(message));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(false);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_exceptionFunction_falseProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(property -> ExampleException.withMessage(
+                                "The boolProperty should be true, but it is `%s`", property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(false);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The boolProperty should be true, but it is `false`", exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_default_nullProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty).isTrueValue();
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The input must be true.", exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_message_nullProperty() {
+        final String message = "The boolProperty should be true.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(message);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_exceptionSupplier_nullProperty() {
+        final String message = "The boolProperty should be true.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(() -> ExampleException.withMessage(message));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isTrueValue_exceptionFunction_nullProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isTrueValue(property -> ExampleException.withMessage(
+                                "The boolProperty should be true, but it is `%s`", property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The boolProperty should be true, but it is `null`", exception.getMessage());
+    }
+
+    // ================================
+    // #endregion - isTrueValue
+    // ================================
+
+    // ================================
+    // #region - isFalseValue
+    // ================================
+
+    @Test
+    void isFalseValue_falseProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty).isFalseValue();
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue("The boolProperty should be false.");
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(() -> ExampleException.withMessage("The boolProperty should be false."));
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(property -> ExampleException.withMessage(
+                                "The boolProperty should be false, but it is `%s`", property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(false);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void isFalseValue_default_trueProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty).isFalseValue();
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(true);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The input must be false.", exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_message_trueProperty() {
+        final String message = "The boolProperty should be false.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(message);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(true);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_exceptionSupplier_trueProperty() {
+        final String message = "The boolProperty should be false.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(() -> ExampleException.withMessage(message));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(true);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_exceptionFunction_trueProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(property -> ExampleException.withMessage(
+                                "The boolProperty should be false, but it is `%s`", property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(true);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The boolProperty should be false, but it is `true`", exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_default_nullProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty).isFalseValue();
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The input must be false.", exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_message_nullProperty() {
+        final String message = "The boolProperty should be false.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(message);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        IllegalArgumentException exception = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_exceptionSupplier_nullProperty() {
+        final String message = "The boolProperty should be false.";
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(() -> ExampleException.withMessage(message));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals(message, exception.getMessage());
+    }
+
+    @Test
+    void isFalseValue_exceptionFunction_nullProperty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isFalseValue(property -> ExampleException.withMessage(
+                                "The boolProperty should be false, but it is `%s`", property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithBoolProperty(null);
+
+        ExampleException exception = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals("The boolProperty should be false, but it is `null`", exception.getMessage());
+    }
+
+    // ================================
+    // #endregion - isFalseValue
+    // ================================
+
+    static ExampleCommand exampleCommandWithBoolProperty(Boolean boolProperty) {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setBoolProperty(boolProperty);
+        return exampleCommand;
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/CollectionPropertyValidatorTests.java

@@ -0,0 +1,277 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.Lists;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class CollectionPropertyValidatorTests {
+
+    static final String MESSAGE_NOT_EMPTY = "The stringListProperty should not be empty.";
+    static final String MESSAGE_EMPTY = "The stringListProperty should be empty.";
+
+    // ================================
+    // #region - notEmpty
+    // ================================
+
+    @Test
+    void notEmpty_stringListIsNotEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).notEmpty();
+                ruleForCollection(ExampleCommand::getStringListProperty).notEmpty(MESSAGE_NOT_EMPTY);
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notEmpty(() -> ExampleException.withMessage(MESSAGE_NOT_EMPTY));
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notEmpty(strList -> ExampleException.withMessage(
+                                "The stringListProperty should not be empty, but it is %s.", strList));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Lists.newArrayList("A", "B", "C"));
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void notEmpty_default_stringListIsEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).notEmpty();
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Collections.emptyList());
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals("The input must not be empty.", e.getMessage());
+    }
+
+    @Test
+    void notEmpty_message_stringListIsEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).notEmpty(MESSAGE_NOT_EMPTY);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Collections.emptyList());
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_NOT_EMPTY, e.getMessage());
+    }
+
+    @Test
+    void notEmpty_exceptionSupplier_stringListIsEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notEmpty(() -> ExampleException.withMessage(MESSAGE_NOT_EMPTY));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Collections.emptyList());
+
+        ExampleException e = assertThrows(ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_NOT_EMPTY, e.getMessage());
+    }
+
+    @Test
+    void notEmpty_exceptionFunction_stringListIsEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notEmpty(strList -> ExampleException.withMessage(
+                                "The stringListProperty should not be empty, but it is %s.", strList));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Collections.emptyList());
+
+        ExampleException e = assertThrows(ExampleException.class, () -> validator.validate(command));
+        assertEquals("The stringListProperty should not be empty, but it is [].", e.getMessage());
+    }
+
+    @Test
+    void notEmpty_message_stringListIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).notEmpty(MESSAGE_NOT_EMPTY);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(null);
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_NOT_EMPTY, e.getMessage());
+    }
+
+    @Test
+    void notEmpty_exceptionSupplier_stringListIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notEmpty(() -> ExampleException.withMessage(MESSAGE_NOT_EMPTY));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(null);
+
+        ExampleException e = assertThrows(ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_NOT_EMPTY, e.getMessage());
+    }
+
+    @Test
+    void notEmpty_exceptionFunction_stringListIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notEmpty(strList -> ExampleException.withMessage(
+                                "The stringListProperty should not be empty, but it is %s.", strList));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(null);
+
+        ExampleException e = assertThrows(ExampleException.class, () -> validator.validate(command));
+        assertEquals("The stringListProperty should not be empty, but it is null.", e.getMessage());
+    }
+
+    // ================================
+    // #endregion - notEmpty
+    // ================================
+
+    // ================================
+    // #region - isEmpty
+    // ================================
+
+    @Test
+    void isEmpty_stringListIsEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).isEmpty();
+                ruleForCollection(ExampleCommand::getStringListProperty).isEmpty(MESSAGE_EMPTY);
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isEmpty(() -> ExampleException.withMessage(MESSAGE_EMPTY));
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isEmpty(strList -> ExampleException.withMessage(
+                                "The stringListProperty should be empty, but it is %s.", strList));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Collections.emptyList());
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void isEmpty_stringListIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).isEmpty();
+                ruleForCollection(ExampleCommand::getStringListProperty).isEmpty(MESSAGE_EMPTY);
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isEmpty(() -> ExampleException.withMessage(MESSAGE_EMPTY));
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isEmpty(strList -> ExampleException.withMessage(
+                                "The stringListProperty should be empty, but it is %s.", strList));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(null);
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void isEmpty_default_stringListIsNotEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).isEmpty();
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Lists.newArrayList("A", "B", "C"));
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals("The input must be empty.", e.getMessage());
+    }
+
+    @Test
+    void isEmpty_message_stringListIsNotEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty).isEmpty(MESSAGE_EMPTY);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Lists.newArrayList("A", "B", "C"));
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_EMPTY, e.getMessage());
+    }
+
+    @Test
+    void isEmpty_exceptionSupplier_stringListIsNotEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isEmpty(() -> ExampleException.withMessage(MESSAGE_EMPTY));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Lists.newArrayList("A", "B", "C"));
+
+        ExampleException e = assertThrows(ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_EMPTY, e.getMessage());
+    }
+
+    @Test
+    void isEmpty_exceptionFunction_stringListIsNotEmpty() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isEmpty(strList -> ExampleException.withMessage(
+                                "The stringListProperty should be empty, but it is %s.", strList));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithStringListProperty(Lists.newArrayList("A", "B", "C"));
+
+        ExampleException e = assertThrows(ExampleException.class, () -> validator.validate(command));
+        assertEquals("The stringListProperty should be empty, but it is [A, B, C].", e.getMessage());
+    }
+
+    // ================================
+    // #endregion - isEmpty
+    // ================================
+
+    static ExampleCommand exampleCommandWithStringListProperty(List<String> property) {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setStringListProperty(property);
+        return exampleCommand;
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/ComparablePropertyValidatorTests.java

@@ -0,0 +1,250 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.chrono.ChronoLocalDateTime;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.Range;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class ComparablePropertyValidatorTests {
+
+    static final LocalDateTime MIN = LocalDate.of(2025, 5, 1).atStartOfDay();
+    static final LocalDateTime MAX = LocalDate.of(2025, 5, 31).atStartOfDay();
+    static final Range<ChronoLocalDateTime<?>> DATE_TIME_RANGE = Range.closedOpen(MIN, MAX);
+
+    static final String MESSAGE = String.format("The value should in the interval [%s,%s)", MIN, MAX);
+
+    // ================================
+    // #region - in the interval
+    // ================================
+
+    @Test
+    void inRange_valueIsInTheInterval() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE);
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, MESSAGE);
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, () -> ExampleException.withMessage(MESSAGE));
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, property -> ExampleException.withMessage(
+                                "The dateTimeProperty should in the interval [%s,%s), but it is %s", MIN, MAX, property));
+
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .inRange(Range.closed(18, 60));
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .inRange(Range.closed(10000000000L, 20000000000L));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(18, 10000000000L, MIN);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - in the interval
+    // ================================
+
+    // ================================
+    // #region - not in the interval
+    // ================================
+
+    @Test
+    void inRange_default_valueIsNotInTheInterval() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(18, 10000000000L, MAX);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        final String expected = String.format("The input must in the interval %s. You entered %s.", DATE_TIME_RANGE, MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    @Test
+    void inRange_message_valueIsNotInTheInterval() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, MESSAGE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(18, 10000000000L, MAX);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals(MESSAGE, e.getMessage());
+    }
+
+    @Test
+    void inRange_exceptionSupplier_valueIsNotInTheInterval() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, () -> ExampleException.withMessage(MESSAGE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(18, 10000000000L, MAX);
+
+        ExampleException e = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals(MESSAGE, e.getMessage());
+    }
+
+    @Test
+    void inRange_exceptionFunction_valueIsNotInTheInterval() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, property -> ExampleException.withMessage(
+                                "The dateTimeProperty should in the interval [%s,%s), but it is %s", MIN, MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(18, 10000000000L, MAX);
+
+        ExampleException e = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        final String expected = String.format("The dateTimeProperty should in the interval [%s,%s), but it is %s", MIN, MAX, MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - not in the interval
+    // ================================
+
+    // ================================
+    // #region - null
+    // ================================
+
+    @Test
+    void inRange_default_valueIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(null, null, null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        final String expected = String.format("The input must in the interval %s. You entered null.", DATE_TIME_RANGE);
+        assertEquals(expected, e.getMessage());
+    }
+
+    @Test
+    void inRange_message_valueIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, MESSAGE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(null, null, null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class,
+                () -> validator.validate(command));
+
+        assertEquals(MESSAGE, e.getMessage());
+    }
+
+    @Test
+    void inRange_exceptionSupplier_valueIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, () -> ExampleException.withMessage(MESSAGE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(null, null, null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        assertEquals(MESSAGE, e.getMessage());
+    }
+
+    @Test
+    void inRange_exceptionFunction_valueIsNull() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .inRange(DATE_TIME_RANGE, property -> ExampleException.withMessage(
+                                "The dateTimeProperty should in the interval [%s,%s), but it is %s", MIN, MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithComparableProperty(null, null, null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class,
+                () -> validator.validate(command));
+
+        final String expected = String.format("The dateTimeProperty should in the interval [%s,%s), but it is null", MIN, MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - null
+    // ================================
+
+    static ExampleCommand exampleCommandWithComparableProperty(
+            Integer intProperty,
+            Long longProperty,
+            LocalDateTime dateTimeProperty) {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setIntProperty(intProperty);
+        exampleCommand.setLongProperty(longProperty);
+        exampleCommand.setDateTimeProperty(dateTimeProperty);
+        return exampleCommand;
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/DoublePropertyValidatorTests.java

@@ -0,0 +1,773 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class DoublePropertyValidatorTests {
+
+    static final double MIN = 1.0;
+    static final double MAX = 5.0;
+
+    static final String MESSAGE_GT = "The input must be greater than " + MIN;
+    static final String MESSAGE_GE = "The input must be greater than or equal to " + MIN;
+
+    static final String MESSAGE_LT = "The input must be less than " + MAX;
+    static final String MESSAGE_LE = "The input must be less than or equal to " + MAX;
+
+    // ================================
+    // #region - gt_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN + 0.000000000000001, Double.MAX_VALUE })
+    void gt_all_validValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, MESSAGE_GT);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The doubleProperty should be greater than %s, but it is %s", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - gt_validValue
+    // ================================
+
+    // ================================
+    // #region - gt_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN, MIN - 0.000000000000001, Double.MIN_VALUE })
+    void gt_default_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than '%s'.", MIN), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN, MIN - 0.000000000000001, Double.MIN_VALUE })
+    void gt_message_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, MESSAGE_GT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN, MIN - 0.000000000000001, Double.MIN_VALUE })
+    void gt_exceptionSupplier_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN, MIN - 0.000000000000001, Double.MIN_VALUE })
+    void gt_exceptionFunction_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The doubleProperty should be greater than %s, but it is %s", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be greater than %s, but it is %s", MIN, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - gt_invalidValue
+    // ================================
+
+    // ================================
+    // #region - gt_null
+    // ================================
+
+    @Test
+    void gt_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than '%s'.", MIN), e.getMessage());
+    }
+
+    @Test
+    void gt_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, MESSAGE_GT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @Test
+    void gt_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @Test
+    void gt_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The doubleProperty should be greater than %s, but it is %s", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be greater than %s, but it is null", MIN);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - gt_null
+    // ================================
+
+    // ================================
+    // #region - ge_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN, MIN + 0.000000000000001, Double.MAX_VALUE })
+    void ge_all_validValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, MESSAGE_GE);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The doubleProperty should be greater than or equal to %s, but it is %s", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - ge_validValue
+    // ================================
+
+    // ================================
+    // #region - ge_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN - 0.000000000000001, Double.MIN_VALUE })
+    void ge_default_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than or equal to '%s'.", MIN), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN - 0.000000000000001, Double.MIN_VALUE })
+    void ge_message_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, MESSAGE_GE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN - 0.000000000000001, Double.MIN_VALUE })
+    void ge_exceptionSupplier_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MIN - 0.000000000000001, Double.MIN_VALUE })
+    void ge_exceptionFunction_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The doubleProperty should be greater than or equal to %s, but it is %s", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be greater than or equal to %s, but it is %s", MIN, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - ge_invalidValue
+    // ================================
+
+    // ================================
+    // #region - ge_null
+    // ================================
+
+    @Test
+    void ge_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than or equal to '%s'.", MIN), e.getMessage());
+    }
+
+    @Test
+    void ge_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, MESSAGE_GE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @Test
+    void ge_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @Test
+    void ge_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The doubleProperty should be greater than or equal to %s, but it is %s", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be greater than or equal to %s, but it is null", MIN);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - ge_null
+    // ================================
+
+    // ================================
+    // #region - lt_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX - 0.000000000000001, Double.MIN_VALUE })
+    void lt_all_validValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, MESSAGE_LT);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The doubleProperty should be less than %s, but it is %s", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - lt_validValue
+    // ================================
+
+    // ================================
+    // #region - lt_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX, MAX + 0.000000000000001, Double.MAX_VALUE })
+    void lt_default_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than '%s'.", MAX), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX, MAX + 0.000000000000001, Double.MAX_VALUE })
+    void lt_message_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, MESSAGE_LT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX, MAX + 0.000000000000001, Double.MAX_VALUE })
+    void lt_exceptionSupplier_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX, MAX + 0.000000000000001, Double.MAX_VALUE })
+    void lt_exceptionFunction_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The doubleProperty should be less than %s, but it is %s", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be less than %s, but it is %s", MAX, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - lt_invalidValue
+    // ================================
+
+    // ================================
+    // #region - lt_null
+    // ================================
+
+    @Test
+    void lt_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than '%s'.", MAX), e.getMessage());
+    }
+
+    @Test
+    void lt_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, MESSAGE_LT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @Test
+    void lt_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @Test
+    void lt_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The doubleProperty should be less than %s, but it is %s", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be less than %s, but it is null", MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - lt_null
+    // ================================
+
+    // ================================
+    // #region - le_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX, MAX - 0.000000000000001, Double.MIN_VALUE })
+    void le_all_validValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, MESSAGE_LE);
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The doubleProperty should be less than or equal to %s, but it is %s", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - le_validValue
+    // ================================
+
+    // ================================
+    // #region - le_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX + 0.000000000000001, Double.MAX_VALUE })
+    void le_default_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than or equal to '%s'.", MAX), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX + 0.000000000000001, Double.MAX_VALUE })
+    void le_message_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, MESSAGE_LE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX + 0.000000000000001, Double.MAX_VALUE })
+    void le_exceptionSupplier_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(doubles = { MAX + 0.000000000000001, Double.MAX_VALUE })
+    void le_exceptionFunction_invalidValue(double value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The doubleProperty should be less than or equal to %s, but it is %s", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be less than or equal to %s, but it is %s", MAX, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - le_invalidValue
+    // ================================
+
+    // ================================
+    // #region - le_null
+    // ================================
+
+    @Test
+    void le_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than or equal to '%s'.", MAX), e.getMessage());
+    }
+
+    @Test
+    void le_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, MESSAGE_LE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @Test
+    void le_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @Test
+    void le_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The doubleProperty should be less than or equal to %s, but it is %s", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithDoubleProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The doubleProperty should be less than or equal to %s, but it is null", MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - le_null
+    // ================================
+
+    static ExampleCommand exampleCommandWithDoubleProperty(Double doubleProperty) {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setDoubleProperty(doubleProperty);
+        return exampleCommand;
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/IntPropertyValidatorTests.java

@@ -0,0 +1,772 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class IntPropertyValidatorTests {
+
+    static final int MIN = 0;
+    static final int MAX = 5;
+
+    static final String MESSAGE_GT = "The value should be greater than " + MIN;
+    static final String MESSAGE_GE = "The value should be greater than or equal to " + MIN;
+
+    static final String MESSAGE_LT = "The value should be less than " + MAX;
+    static final String MESSAGE_LE = "The value should be less than or equal to " + MAX;
+
+    // ================================
+    // #region - gt_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN + 1, Integer.MAX_VALUE })
+    void gt_all_validValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, MESSAGE_GT);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The intProperty should be greater than %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - gt_validValue
+    // ================================
+
+    // ================================
+    // #region - gt_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN, MIN - 1, Integer.MIN_VALUE })
+    void gt_default_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than '%d'.", MIN), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN, MIN - 1, Integer.MIN_VALUE })
+    void gt_message_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, MESSAGE_GT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN, MIN - 1, Integer.MIN_VALUE })
+    void gt_exceptionSupplier_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN, MIN - 1, Integer.MIN_VALUE })
+    void gt_exceptionFunction_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The intProperty should be greater than %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be greater than %d, but it is %d", MIN, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - gt_invalidValue
+    // ================================
+
+    // ================================
+    // #region - gt_null
+    // ================================
+
+    @Test
+    void gt_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than '%d'.", MIN), e.getMessage());
+    }
+
+    @Test
+    void gt_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, MESSAGE_GT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @Test
+    void gt_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @Test
+    void gt_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The intProperty should be greater than %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be greater than %d, but it is null", MIN);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - gt_null
+    // ================================
+
+    // ================================
+    // #region - ge_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN, MIN + 1, Integer.MAX_VALUE })
+    void ge_all_validValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, MESSAGE_GE);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The intProperty should be greater than or equal to %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - ge_validValue
+    // ================================
+
+    // ================================
+    // #region - ge_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN - 1, Integer.MIN_VALUE })
+    void ge_default_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than or equal to '%d'.",  MIN), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN - 1, Integer.MIN_VALUE })
+    void ge_message_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, MESSAGE_GE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN - 1, Integer.MIN_VALUE })
+    void ge_exceptionSupplier_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MIN - 1, Integer.MIN_VALUE })
+    void ge_exceptionFunction_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The intProperty should be greater than or equal to %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be greater than or equal to %d, but it is %d", MIN, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - ge_invalidValue
+    // ================================
+
+    // ================================
+    // #region - ge_null
+    // ================================
+
+    @Test
+    void ge_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than or equal to '%d'.", MIN), e.getMessage());
+    }
+
+    @Test
+    void ge_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, MESSAGE_GE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @Test
+    void ge_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @Test
+    void ge_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The intProperty should be greater than or equal to %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be greater than or equal to %d, but it is null", MIN);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - ge_null
+    // ================================
+
+    // ================================
+    // #region - lt_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX - 1, Integer.MIN_VALUE })
+    void lt_all_validValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, MESSAGE_LT);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The intProperty should be less than %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - lt_validValue
+    // ================================
+
+    // ================================
+    // #region - lt_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX, MAX + 1, Integer.MAX_VALUE })
+    void lt_default_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than '%d'.", MAX), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX, MAX + 1, Integer.MAX_VALUE })
+    void lt_message_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, MESSAGE_LT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX, MAX + 1, Integer.MAX_VALUE })
+    void lt_exceptionSupplier_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX, MAX + 1, Integer.MAX_VALUE })
+    void lt_exceptionFunction_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The intProperty should be less than %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be less than %d, but it is %d", MAX, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - lt_invalidValue
+    // ================================
+
+    // ================================
+    // #region - lt_null
+    // ================================
+
+    @Test
+    void lt_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than '%d'.", MAX), e.getMessage());
+    }
+
+    @Test
+    void lt_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, MESSAGE_LT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @Test
+    void lt_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @Test
+    void lt_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The intProperty should be less than %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be less than %d, but it is null", MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - lt_null
+    // ================================
+
+    // ================================
+    // #region - le_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX, MAX - 1, Integer.MIN_VALUE })
+    void le_all_validValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, MESSAGE_LE);
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The intProperty should be less than or equal to %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - le_validValue
+    // ================================
+
+    // ================================
+    // #region - le_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX + 1, Integer.MAX_VALUE })
+    void le_default_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than or equal to '%d'.", MAX), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX + 1, Integer.MAX_VALUE })
+    void le_message_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, MESSAGE_LE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX + 1, Integer.MAX_VALUE })
+    void le_exceptionSupplier_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(ints = { MAX + 1, Integer.MAX_VALUE })
+    void le_exceptionFunction_invalidValue(int value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The intProperty should be less than or equal to %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be less than or equal to %d, but it is %d", MAX, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - le_invalidValue
+    // ================================
+
+    // ================================
+    // #region - le_null
+    // ================================
+
+    @Test
+    void le_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than or equal to '%d'.", MAX), e.getMessage());
+    }
+
+    @Test
+    void le_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, MESSAGE_LE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @Test
+    void le_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @Test
+    void le_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The intProperty should be less than or equal to %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithIntProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The intProperty should be less than or equal to %d, but it is null", MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - le_null
+    // ================================
+
+    static ExampleCommand exampleCommandWithIntProperty(Integer intProperty) {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setIntProperty(intProperty);
+        return exampleCommand;
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/LongPropertyValidatorTests.java

@@ -0,0 +1,773 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class LongPropertyValidatorTests {
+
+    static final long MIN = 10000000000L;
+    static final long MAX = 10000000008L;
+
+
+    static final String MESSAGE_GT = "The value should be greater than " + MIN;
+    static final String MESSAGE_GE = "The value should be greater than or equal to " + MIN;
+
+    static final String MESSAGE_LT = "The value should be less than " + MAX;
+    static final String MESSAGE_LE = "The value should be less than or equal to " + MAX;
+
+    // ================================
+    // #region - gt_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN + 1, Long.MAX_VALUE })
+    void gt_all_validValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, MESSAGE_GT);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The longProperty should be greater than %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - gt_validValue
+    // ================================
+
+    // ================================
+    // #region - gt_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN, MIN - 1, Long.MIN_VALUE })
+    void gt_default_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than '%d'.", MIN), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN, MIN - 1, Long.MIN_VALUE })
+    void gt_message_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, MESSAGE_GT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN, MIN - 1, Long.MIN_VALUE })
+    void gt_exceptionSupplier_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN, MIN - 1, Long.MIN_VALUE })
+    void gt_exceptionFunction_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The longProperty should be greater than %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be greater than %d, but it is %d", MIN, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - gt_invalidValue
+    // ================================
+
+    // ================================
+    // #region - gt_null
+    // ================================
+
+    @Test
+    void gt_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than '%d'.", MIN), e.getMessage());
+    }
+
+    @Test
+    void gt_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, MESSAGE_GT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @Test
+    void gt_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, () -> ExampleException.withMessage(MESSAGE_GT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GT, e.getMessage());
+    }
+
+    @Test
+    void gt_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .gt(MIN, property -> ExampleException.withMessage(
+                                "The longProperty should be greater than %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be greater than %d, but it is null", MIN);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - gt_null
+    // ================================
+
+    // ================================
+    // #region - ge_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN, MIN + 1, Long.MAX_VALUE })
+    void ge_all_validValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, MESSAGE_GE);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The longProperty should be greater than or equal to %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - ge_validValue
+    // ================================
+
+    // ================================
+    // #region - ge_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN - 1, Long.MIN_VALUE })
+    void ge_default_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than or equal to '%d'.", MIN), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN - 1, Long.MIN_VALUE })
+    void ge_message_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, MESSAGE_GE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN - 1, Long.MIN_VALUE })
+    void ge_exceptionSupplier_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MIN - 1, Long.MIN_VALUE })
+    void ge_exceptionFunction_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The longProperty should be greater than or equal to %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be greater than or equal to %d, but it is %d", MIN, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - ge_invalidValue
+    // ================================
+
+    // ================================
+    // #region - ge_null
+    // ================================
+
+    @Test
+    void ge_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be greater than or equal to '%d'.", MIN), e.getMessage());
+    }
+
+    @Test
+    void ge_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, MESSAGE_GE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @Test
+    void ge_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, () -> ExampleException.withMessage(MESSAGE_GE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_GE, e.getMessage());
+    }
+
+    @Test
+    void ge_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .ge(MIN, property -> ExampleException.withMessage(
+                                "The longProperty should be greater than or equal to %d, but it is %d", MIN, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be greater than or equal to %d, but it is null", MIN);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - ge_null
+    // ================================
+
+    // ================================
+    // #region - lt_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX - 1, Long.MIN_VALUE })
+    void lt_all_validValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, MESSAGE_LT);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The longProperty should be less than %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - lt_validValue
+    // ================================
+
+    // ================================
+    // #region - lt_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX, MAX + 1, Long.MAX_VALUE })
+    void lt_default_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than '%d'.", MAX), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX, MAX + 1, Long.MAX_VALUE })
+    void lt_message_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, MESSAGE_LT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX, MAX + 1, Long.MAX_VALUE })
+    void lt_exceptionSupplier_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX, MAX + 1, Long.MAX_VALUE })
+    void lt_exceptionFunction_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The longProperty should be less than %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be less than %d, but it is %d", MAX, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - lt_invalidValue
+    // ================================
+
+    // ================================
+    // #region - lt_null
+    // ================================
+
+    @Test
+    void lt_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than '%d'.", MAX), e.getMessage());
+    }
+
+    @Test
+    void lt_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, MESSAGE_LT);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @Test
+    void lt_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, () -> ExampleException.withMessage(MESSAGE_LT));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LT, e.getMessage());
+    }
+
+    @Test
+    void lt_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .lt(MAX, property -> ExampleException.withMessage(
+                                "The longProperty should be less than %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be less than %d, but it is null", MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - lt_null
+    // ================================
+
+    // ================================
+    // #region - le_validValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX, MAX - 1, Long.MIN_VALUE })
+    void le_all_validValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, MESSAGE_LE);
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The longProperty should be less than or equal to %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - le_validValue
+    // ================================
+
+    // ================================
+    // #region - le_invalidValue
+    // ================================
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX + 1, Long.MAX_VALUE })
+    void le_default_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than or equal to '%d'.", MAX), e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX + 1, Long.MAX_VALUE })
+    void le_message_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, MESSAGE_LE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX + 1, Long.MAX_VALUE })
+    void le_exceptionSupplier_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @ParameterizedTest
+    @ValueSource(longs = { MAX + 1, Long.MAX_VALUE })
+    void le_exceptionFunction_invalidValue(long value) {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The longProperty should be less than or equal to %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(value);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be less than or equal to %d, but it is %d", MAX, value);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - le_invalidValue
+    // ================================
+
+    // ================================
+    // #region - le_null
+    // ================================
+
+    @Test
+    void le_default_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(String.format("The input must be less than or equal to '%d'.", MAX), e.getMessage());
+    }
+
+    @Test
+    void le_message_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, MESSAGE_LE);
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        IllegalArgumentException e = assertThrows(
+                IllegalArgumentException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @Test
+    void le_exceptionSupplier_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, () -> ExampleException.withMessage(MESSAGE_LE));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        assertEquals(MESSAGE_LE, e.getMessage());
+    }
+
+    @Test
+    void le_exceptionFunction_null() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .le(MAX, property -> ExampleException.withMessage(
+                                "The longProperty should be less than or equal to %d, but it is %d", MAX, property));
+            }
+        };
+
+        ExampleCommand command = exampleCommandWithLongProperty(null);
+
+        ExampleException e = assertThrows(
+                ExampleException.class, () -> validator.validate(command));
+        final String expected = String.format("The longProperty should be less than or equal to %d, but it is null", MAX);
+        assertEquals(expected, e.getMessage());
+    }
+
+    // ================================
+    // #endregion - le_null
+    // ================================
+
+    static ExampleCommand exampleCommandWithLongProperty(Long longProperty) {
+        ExampleCommand exampleCommand = new ExampleCommand();
+        exampleCommand.setLongProperty(longProperty);
+        return exampleCommand;
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/ObjectPropertyValidatorTests.java

@@ -0,0 +1,529 @@
+/*
+ * Copyright 2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package xyz.zhouxy.plusone.example.validator;
+
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+import java.time.DateTimeException;
+import java.time.LocalDateTime;
+import java.util.Objects;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Lists;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.commons.collection.CollectionTools;
+import xyz.zhouxy.plusone.commons.util.DateTimeTools;
+import xyz.zhouxy.plusone.commons.util.StringTools;
+import xyz.zhouxy.plusone.example.ExampleCommand;
+import xyz.zhouxy.plusone.example.Foo;
+import xyz.zhouxy.plusone.validator.BaseValidator;
+
+public class ObjectPropertyValidatorTests {
+
+    // ================================
+    // #region - withRule
+    // ================================
+
+    @Test
+    void withRule() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getBoolProperty)
+                        .notNull("The boolProperty cannot be null.")
+                        .withRule(Boolean.TRUE::equals, "The boolProperty should be true.");
+
+                ruleFor(ExampleCommand::getIntProperty)
+                        .withRule(intProperty -> intProperty > 0, "The intProperty should be greater than 0.");
+
+                ruleFor(ExampleCommand::getLongProperty)
+                        .withRule(longProperty -> longProperty > 0L,
+                                () -> ExampleException.withMessage("The longProperty should be greater than 0."));
+
+                ruleFor(ExampleCommand::getDoubleProperty)
+                        .withRule(doubleProperty -> doubleProperty > 0.00,
+                                doubleProperty -> ExampleException.withMessage("The doubleProperty should be greater than 0, but it was: %s", doubleProperty));
+
+                ruleFor(ExampleCommand::getStringProperty)
+                        .notNull()
+                        .withRule(stringProperty -> stringProperty.length() > 2,
+                                () -> ExampleException.withMessage("The length of stringProperty should be greater than 2."));
+
+                ruleFor(ExampleCommand::getDateTimeProperty)
+                        .withRule(DateTimeTools::isFuture,
+                                () -> new DateTimeException("The dateTimeProperty should be a future time."));
+
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .notNull("The objectProperty cannot be null.");
+
+                ruleFor(ExampleCommand::getStringListProperty)
+                        .withRule(CollectionTools::isNotEmpty, "The stringListProperty cannot be empty.");
+
+                withRule(command -> {
+                    Foo objectProperty = command.getObjectProperty();
+                    if (!Objects.equals(command.getIntProperty(), objectProperty.getIntProperty())) {
+                        throw ExampleException.withMessage("intProperty invalid.");
+                    }
+                });
+            }
+        };
+
+        ExampleCommand command = new ExampleCommand(
+                true,
+                Integer.MAX_VALUE,
+                Long.MAX_VALUE,
+                Double.MAX_VALUE,
+                "StringValue",
+                LocalDateTime.now().plusDays(1),
+                new Foo(Integer.MAX_VALUE, "StringValue"),
+                Lists.newArrayList("ABC", "DEF"));
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    // ================================
+    // #endregion - withRule
+    // ================================
+
+    // ================================
+    // #region - notNull
+    // ================================
+
+    @Test
+    void notNull_validInput() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .notNull();
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .notNull("The intProperty cannot be null");
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .notNull(() -> ExampleException.withMessage("The longProperty cannot be null"));
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .notNull(d -> ExampleException.withMessage("The doubleProperty cannot be null, but it was %s", d));
+                ruleForString(ExampleCommand::getStringProperty)
+                        .notNull();
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .notNull("The dateTimeProperty cannot be null");
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .notNull(() -> ExampleException.withMessage("The objectProperty cannot be null"));
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .notNull(d -> ExampleException.withMessage("The stringListProperty cannot be null, but it was %s", d));
+            }
+        };
+        ExampleCommand command = new ExampleCommand(
+                true,
+                Integer.MAX_VALUE,
+                Long.MAX_VALUE,
+                Double.MAX_VALUE,
+                "StringValue",
+                LocalDateTime.now().plusDays(1),
+                new Foo(Integer.MAX_VALUE, "StringValue"),
+                Lists.newArrayList("ABC", "DEF"));
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void notNull_invalidInput() {
+        ExampleCommand command = new ExampleCommand();
+
+        BaseValidator<ExampleCommand> defaultRule = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .notNull();
+            }
+        };
+        IllegalArgumentException eWithDefaultMessage = assertThrows(
+                IllegalArgumentException.class, () -> defaultRule.validate(command));
+        assertEquals("The input must not be null.", eWithDefaultMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .notNull("The objectProperty could not be null.");
+            }
+        };
+        IllegalArgumentException eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The objectProperty could not be null.", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .notNull(() -> ExampleException.withMessage("The objectProperty could not be null."));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The objectProperty could not be null.", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .notNull(str -> ExampleException.withMessage("The objectProperty could not be null, but is was " + str));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The objectProperty could not be null, but is was null", specifiedException2.getMessage());
+    }
+
+    // ================================
+    // #endregion - notNull
+    // ================================
+
+    // ================================
+    // #region - isNull
+    // ================================
+
+    @Test
+    void isNull_validInput() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForBool(ExampleCommand::getBoolProperty)
+                        .isNull();
+                ruleForInt(ExampleCommand::getIntProperty)
+                        .isNull("The intProperty should be null");
+                ruleForLong(ExampleCommand::getLongProperty)
+                        .isNull(() -> ExampleException.withMessage("The longProperty should be null"));
+                ruleForDouble(ExampleCommand::getDoubleProperty)
+                        .isNull(d -> ExampleException.withMessage("The doubleProperty should be null, but it was %s", d));
+                ruleForString(ExampleCommand::getStringProperty)
+                        .isNull();
+                ruleForComparable(ExampleCommand::getDateTimeProperty)
+                        .isNull("The dateTimeProperty should be null");
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .isNull(() -> ExampleException.withMessage("The objectProperty should be null"));
+                ruleForCollection(ExampleCommand::getStringListProperty)
+                        .isNull(d -> ExampleException.withMessage("The stringListProperty should be null, but it was %s", d));
+            }
+        };
+        ExampleCommand command = new ExampleCommand();
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void isNull_invalidInput() {
+        ExampleCommand command = new ExampleCommand();
+        command.setObjectProperty(new Foo(Integer.MAX_VALUE, "StringValue"));
+
+        BaseValidator<ExampleCommand> ruleWithDefaultMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .isNull();
+            }
+        };
+        IllegalArgumentException eWithDefaultMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithDefaultMessage.validate(command));
+        assertEquals("The input must be null.", eWithDefaultMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .isNull("The objectProperty should be null.");
+            }
+        };
+        IllegalArgumentException eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The objectProperty should be null.", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .isNull(() -> ExampleException.withMessage("The objectProperty should be null."));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The objectProperty should be null.", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                ruleFor(ExampleCommand::getObjectProperty)
+                        .isNull(str -> ExampleException.withMessage("The objectProperty should be null, but is was " + str));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The objectProperty should be null, but is was " + command.getObjectProperty(), specifiedException2.getMessage());
+    }
+
+    // ================================
+    // #endregion - isNull
+    // ================================
+
+    // ================================
+    // #region - equalsThat
+    // ================================
+
+    @Test
+    void equalsThat_validInput() {
+        BaseValidator<ExampleCommand> validator = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .equalsThat("Foo")
+                        .equalsThat("Foo", "The stringProperty should be equal to 'Foo'.")
+                        .equalsThat("Foo", () ->
+                                ExampleException.withMessage("The stringProperty should be equal to 'Foo'."))
+                        .equalsThat("Foo", str ->
+                                ExampleException.withMessage("The stringProperty should be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        ExampleCommand command = new ExampleCommand();
+        command.setStringProperty("Foo");
+
+        assertDoesNotThrow(() -> validator.validate(command));
+    }
+
+    @Test
+    void equalsThat_invalidInput() {
+        ExampleCommand command = new ExampleCommand();
+        command.setStringProperty("Bar");
+
+        BaseValidator<ExampleCommand> defaultRule = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo");
+            }
+        };
+        IllegalArgumentException eWithDefaultMessage = assertThrows(
+                IllegalArgumentException.class, () -> defaultRule.validate(command));
+        assertEquals("The input must be equal to 'Foo'.", eWithDefaultMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo",
+                        "The stringProperty should be equal to 'Foo'.");
+            }
+        };
+        IllegalArgumentException eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The stringProperty should be equal to 'Foo'.", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo",
+                        () -> ExampleException.withMessage("The stringProperty should be equal to 'Foo'."));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The stringProperty should be equal to 'Foo'.", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo",
+                        str -> ExampleException.withMessage("The stringProperty should be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The stringProperty should be equal to 'Foo', but is was 'Bar'.", specifiedException2.getMessage());
+    }
+
+    @Test
+    void equalsThat_nullInput() {
+        ExampleCommand command = new ExampleCommand();
+
+        BaseValidator<ExampleCommand> defaultRule = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo");
+            }
+        };
+        IllegalArgumentException eWithDefaultMessage = assertThrows(
+                IllegalArgumentException.class, () -> defaultRule.validate(command));
+        assertEquals("The input must be equal to 'Foo'.", eWithDefaultMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo",
+                        "The stringProperty should be equal to 'Foo'.");
+            }
+        };
+        IllegalArgumentException eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The stringProperty should be equal to 'Foo'.", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo",
+                        () -> ExampleException.withMessage("The stringProperty should be equal to 'Foo'."));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The stringProperty should be equal to 'Foo'.", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty).equalsThat("Foo",
+                        str -> ExampleException.withMessage("The stringProperty should be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The stringProperty should be equal to 'Foo', but is was 'null'.", specifiedException2.getMessage());
+    }
+
+    // ================================
+    // #endregion - equalsThat
+    // ================================
+
+    // ================================
+    // #region - must
+    // ================================
+
+    @Test
+    void must_oneCondition_valid() {
+        ExampleCommand command = new ExampleCommand();
+        command.setStringProperty("Foo");
+
+        BaseValidator<ExampleCommand> ruleWithDefaultMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(str -> Objects.equals(str, "Foo"))
+                        .must(str -> Objects.equals(str, "Foo"), "The stringProperty must be equal to 'Foo'.")
+                        .must(str -> Objects.equals(str, "Foo"), () -> ExampleException.withMessage("The stringProperty must be equal to 'Foo'."))
+                        .must(str -> Objects.equals(str, "Foo"), str -> ExampleException.withMessage("The stringProperty must be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        assertDoesNotThrow(() -> ruleWithDefaultMessage.validate(command));
+    }
+
+    @Test
+    void must_oneCondition_invalid() {
+        ExampleCommand command = new ExampleCommand();
+
+        BaseValidator<ExampleCommand> ruleWithDefaultMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(str -> Objects.equals(str, "Foo"));
+            }
+        };
+        IllegalArgumentException  eWithDefaultMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithDefaultMessage.validate(command));
+        assertEquals("The specified condition was not met for the input.", eWithDefaultMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(str -> Objects.equals(str, "Foo"),
+                                "The stringProperty must be equal to 'Foo'.");
+            }
+        };
+        IllegalArgumentException  eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo'.", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(str -> Objects.equals(str, "Foo"),
+                                () -> ExampleException.withMessage("The stringProperty must be equal to 'Foo'."));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo'.", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(str -> Objects.equals(str, "Foo"),
+                                str -> ExampleException.withMessage("The stringProperty must be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo', but is was 'null'.", specifiedException2.getMessage());
+    }
+
+    @Test
+    void must_multipleConditions_valid() {
+        ExampleCommand command = new ExampleCommand();
+        command.setStringProperty("Foo");
+
+        BaseValidator<ExampleCommand> ruleWithDefaultMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")))
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")), "The stringProperty must be equal to 'Foo'.")
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")), () -> ExampleException.withMessage("The stringProperty must be equal to 'Foo'."))
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")), str -> ExampleException.withMessage("The stringProperty must be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        assertDoesNotThrow(() -> ruleWithDefaultMessage.validate(command));
+    }
+
+    @Test
+    void must_multipleConditions_invalid() {
+        ExampleCommand command = new ExampleCommand();
+        command.setStringProperty("Bar");
+
+        BaseValidator<ExampleCommand> ruleWithDefaultMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")));
+            }
+        };
+        IllegalArgumentException  eWithDefaultMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithDefaultMessage.validate(command));
+        assertEquals("The specified conditions were not met for the input.", eWithDefaultMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithMessage = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")),
+                                "The stringProperty must be equal to 'Foo'.");
+            }
+        };
+        IllegalArgumentException  eWithSpecifiedMessage = assertThrows(
+                IllegalArgumentException.class, () -> ruleWithMessage.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo'.", eWithSpecifiedMessage.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionSupplier = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")),
+                                () -> ExampleException.withMessage("The stringProperty must be equal to 'Foo'."));
+            }
+        };
+        ExampleException specifiedException = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionSupplier.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo'.", specifiedException.getMessage());
+
+        BaseValidator<ExampleCommand> ruleWithExceptionFunction = new BaseValidator<ExampleCommand>() {
+            {
+                ruleForString(ExampleCommand::getStringProperty)
+                        .must(ImmutableList.of(StringTools::isNotEmpty, str -> Objects.equals(str, "Foo")),
+                                str -> ExampleException.withMessage("The stringProperty must be equal to 'Foo', but is was '%s'.", str));
+            }
+        };
+        ExampleException specifiedException2 = assertThrows(
+                ExampleException.class, () -> ruleWithExceptionFunction.validate(command));
+        assertEquals("The stringProperty must be equal to 'Foo', but is was 'Bar'.", specifiedException2.getMessage());
+    }
+
+    // ================================
+    // #endregion - must
+    // ================================
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/example/validator/ValidatorTests.java

@@ -1,5 +1,6 @@
-package xyz.zhouxy.plusone.validator.test;
+package xyz.zhouxy.plusone.example.validator;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
 import static xyz.zhouxy.plusone.commons.constant.PatternConsts.*;
 
 import java.util.Arrays;
@@ -57,8 +58,7 @@ class ValidatorTests {
                 // 传入 predicate 和 error message
                 .addRule(command -> Objects.equals(command.getPassword(), command.getPassword2()),
                         "两次输入的密码不一致");
-        registerCommandValidator.validate(registerCommand);
-        System.out.println(registerCommand);
+        assertDoesNotThrow(() -> registerCommandValidator.validate(registerCommand));
     }
 
     /**

plusone-validator/src/test/java/xyz/zhouxy/plusone/map/validator/MapValidatorTests.java

@@ -0,0 +1,121 @@
+package xyz.zhouxy.plusone.map.validator;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.time.LocalDateTime;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.ImmutableSet;
+
+import xyz.zhouxy.plusone.ExampleException;
+import xyz.zhouxy.plusone.example.Foo;
+import xyz.zhouxy.plusone.validator.MapValidator;
+
+class MapValidatorTests {
+
+    private static final MapValidator<String, Object> validator = ParamsValidator.INSTANCE;
+
+    @Test
+    void testValidateAndCopy() {
+        Map<String, Object> params = new HashMap<>();
+        params.put(ParamsValidator.BOOL_PROPERTY, true);
+        params.put(ParamsValidator.INT_PROPERTY, Integer.MAX_VALUE);
+        params.put(ParamsValidator.LONG_PROPERTY, Long.MAX_VALUE);
+        params.put(ParamsValidator.DOUBLE_PROPERTY, Double.MAX_VALUE);
+        params.put(ParamsValidator.STRING_PROPERTY, "Foo");
+        params.put(ParamsValidator.STRING_PROPERTY2, "Bar");
+        params.put(ParamsValidator.DATE_TIME_PROPERTY, LocalDateTime.of(2008, 8, 8, 20, 8));
+        params.put(ParamsValidator.OBJECT_PROPERTY, new Foo(1, "Foo"));
+        params.put(ParamsValidator.STRING_LIST_PROPERTY, Collections.emptyList());
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class, () -> {
+            validator.validateAndCopy(params);
+        });
+        assertEquals("'stringProperty' must be equal to 'stringProperty2'.", e.getMessage());
+
+        params.put(ParamsValidator.STRING_PROPERTY2, "Foo");
+        assertAll(() -> {
+            Map<String, Object> validatedParams = validator.validateAndCopy(params);
+            assertEquals(ParamsValidator.keySet(), validatedParams.keySet());
+
+            assertEquals(true, validatedParams.get(ParamsValidator.BOOL_PROPERTY));
+            assertEquals(Integer.MAX_VALUE, validatedParams.get(ParamsValidator.INT_PROPERTY));
+            assertEquals(Long.MAX_VALUE, validatedParams.get(ParamsValidator.LONG_PROPERTY));
+            assertEquals(Double.MAX_VALUE, validatedParams.get(ParamsValidator.DOUBLE_PROPERTY));
+            assertEquals("Foo", validatedParams.get(ParamsValidator.STRING_PROPERTY));
+            assertEquals(LocalDateTime.of(2008, 8, 8, 20, 8), validatedParams.get(ParamsValidator.DATE_TIME_PROPERTY));
+            assertEquals(new Foo(1, "Foo"), validatedParams.get(ParamsValidator.OBJECT_PROPERTY));
+            assertEquals(Collections.emptyList(), validatedParams.get(ParamsValidator.STRING_LIST_PROPERTY));
+        });
+
+        assertAll(() -> {
+            Map<String, Object> validatedParams = validator.validateAndCopy(params,
+                    ParamsValidator.LONG_PROPERTY, ParamsValidator.STRING_PROPERTY2);
+            assertEquals(ImmutableSet.of(ParamsValidator.LONG_PROPERTY, ParamsValidator.STRING_PROPERTY2),
+                    validatedParams.keySet());
+
+            assertEquals(Long.MAX_VALUE, validatedParams.get(ParamsValidator.LONG_PROPERTY));
+            assertEquals("Foo", validatedParams.get(ParamsValidator.STRING_PROPERTY2));
+
+        });
+
+        assertAll(() -> {
+            Set<String> keySet = ImmutableSet.of(ParamsValidator.LONG_PROPERTY, ParamsValidator.STRING_PROPERTY2);
+            Map<String, Object> validatedParams = validator.validateAndCopy(params, keySet);
+            assertEquals(keySet, validatedParams.keySet());
+
+            assertEquals(Long.MAX_VALUE, validatedParams.get(ParamsValidator.LONG_PROPERTY));
+            assertEquals("Foo", validatedParams.get(ParamsValidator.STRING_PROPERTY2));
+        });
+    }
+}
+
+class ParamsValidator extends MapValidator<String, Object> {
+    public static final String BOOL_PROPERTY = "boolProperty";
+    public static final String INT_PROPERTY = "intProperty";
+    public static final String LONG_PROPERTY = "longProperty";
+    public static final String DOUBLE_PROPERTY = "doubleProperty";
+    public static final String STRING_PROPERTY = "stringProperty";
+    public static final String STRING_PROPERTY2 = "stringProperty2";
+    public static final String DATE_TIME_PROPERTY = "dateTimeProperty";
+    public static final String OBJECT_PROPERTY = "objectProperty";
+    public static final String STRING_LIST_PROPERTY = "stringListProperty";
+
+    public static final ParamsValidator INSTANCE = new ParamsValidator();
+
+    private ParamsValidator() {
+        super(new String[] { BOOL_PROPERTY, INT_PROPERTY, LONG_PROPERTY, DOUBLE_PROPERTY, STRING_PROPERTY,
+                DATE_TIME_PROPERTY, OBJECT_PROPERTY, STRING_LIST_PROPERTY });
+        ruleForBool(BOOL_PROPERTY)
+                .notNull();
+        ruleForInt(INT_PROPERTY)
+                .notNull("The intProperty cannot be null");
+        ruleForLong(LONG_PROPERTY)
+                .notNull(() -> ExampleException.withMessage("The longProperty cannot be null"));
+        ruleForDouble(DOUBLE_PROPERTY)
+                .notNull(d -> ExampleException.withMessage("The doubleProperty cannot be null, but it was %s", d));
+        ruleForString(STRING_PROPERTY)
+                .notNull();
+        ruleFor(DATE_TIME_PROPERTY)
+                .notNull("The dateTimeProperty cannot be null");
+        ruleFor(OBJECT_PROPERTY)
+                .notNull(() -> ExampleException.withMessage("The objectProperty cannot be null"));
+        ruleForCollection(STRING_LIST_PROPERTY)
+                .notNull(d -> ExampleException.withMessage("The stringListProperty cannot be null, but it was %s", d));
+
+        // 校验到多个属性，只能针对 map 本身进行校验
+        withRule(m -> Objects.equals(m.get(STRING_PROPERTY), m.get(STRING_PROPERTY2)),
+                "'stringProperty' must be equal to 'stringProperty2'.");
+    }
+
+    public static Set<String> keySet() {
+        return ImmutableSet.of(BOOL_PROPERTY, INT_PROPERTY, LONG_PROPERTY, DOUBLE_PROPERTY, STRING_PROPERTY,
+                DATE_TIME_PROPERTY, OBJECT_PROPERTY, STRING_LIST_PROPERTY);
+    }
+}

plusone-validator/src/test/java/xyz/zhouxy/plusone/validator/map/test/MapValidatorTests.java

@@ -1,86 +0,0 @@
-package xyz.zhouxy.plusone.validator.map.test;
-
-import static org.junit.jupiter.api.Assertions.*;
-
-import java.util.Arrays;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Objects;
-import java.util.regex.Pattern;
-
-import org.junit.jupiter.api.Test;
-
-import xyz.zhouxy.plusone.commons.constant.PatternConsts;
-import xyz.zhouxy.plusone.commons.util.StringTools;
-import xyz.zhouxy.plusone.validator.MapValidator;
-
-class MapValidatorTests {
-
-    private static final MapValidator<String, Object> validator = ParamsValidator.INSTANCE;
-
-    @Test
-    void testValidateAndCopy() {
-        Map<String, Object> params = new HashMap<>();
-        params.put(ParamsValidator.USERNAME, "ZhouXY");
-        params.put(ParamsValidator.ACCOUNT, "zhouxy@code108.cn");
-        params.put(ParamsValidator.PASSWORD, "99Code108");
-        params.put(ParamsValidator.PASSWORD2, "99Code108");
-        params.put(ParamsValidator.AGE, 18);
-        params.put(ParamsValidator.BOOLEAN, true);
-
-        params.put(ParamsValidator.ROLE_LIST, Arrays.asList("admin", ""));
-        assertThrows(IllegalArgumentException.class, () -> {
-            validator.validateAndCopy(params);
-        });
-
-        params.put(ParamsValidator.ROLE_LIST, Arrays.asList("admin", "developer"));
-        Map<String, Object> validatedParams = validator.validateAndCopy(params);
-        System.out.println(validatedParams);
-    }
-}
-
-class ParamsValidator extends MapValidator<String, Object> {
-    public static final String USERNAME = "username";
-    public static final String ACCOUNT = "account";
-    public static final String PASSWORD = "password";
-    public static final String PASSWORD2 = "password2";
-    public static final String AGE = "age";
-    public static final String BOOLEAN = "boolean";
-    public static final String ROLE_LIST = "roleList";
-
-    public static final ParamsValidator INSTANCE = new ParamsValidator();
-
-    private ParamsValidator() {
-        super(new String[] { USERNAME, ACCOUNT, PASSWORD, AGE, BOOLEAN, ROLE_LIST });
-        ruleForString(USERNAME)
-                .notBlank("用户名不能为空")
-                .matches(PatternConsts.USERNAME,
-                        username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
-
-        ruleForString(ACCOUNT)
-                .notBlank("账号不能为空")
-                .matchesOne(new Pattern[] { PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE }, "请输入正确的邮箱地址或手机号");
-
-        ruleForString(PASSWORD)
-                .notEmpty("密码不能为空")
-                .matches(PatternConsts.PASSWORD, "密码不符合规范");
-
-        // 校验到多个属性，只能针对 map 本身进行校验
-        withRule(m -> Objects.equals(m.get(PASSWORD), m.get(PASSWORD2)),
-                "两次输入的密码不一样！");
-
-        ruleForInt(AGE)
-                .withRule(Objects::nonNull)
-                .ge(18)
-                .le(60);
-
-        ruleForBool(BOOLEAN)
-                .notNull("Boolean property could not be null.")
-                .isTrueValue("Boolean property must be true.");
-
-        this.<String>ruleForCollection(ROLE_LIST)
-                .notEmpty("角色列表不能为空！")
-                .withRule(l -> l.stream().allMatch(StringTools::isNotBlank),
-                        () -> new IllegalArgumentException("角色标识不能为空！"));
-    }
-}

plusone-validator/src/test/java/xyz/zhouxy/plusone/validator/test/BaseValidatorTest.java

@@ -1,169 +0,0 @@
-package xyz.zhouxy.plusone.validator.test;
-
-import java.time.Year;
-import java.util.Arrays;
-import java.util.List;
-import java.util.Objects;
-
-import org.junit.jupiter.api.Test;
-
-import com.google.common.collect.Range;
-
-import xyz.zhouxy.plusone.commons.constant.PatternConsts;
-import xyz.zhouxy.plusone.commons.function.PredicateTools;
-import xyz.zhouxy.plusone.commons.util.RegexTools;
-import xyz.zhouxy.plusone.commons.util.StringTools;
-import xyz.zhouxy.plusone.validator.BaseValidator;
-import xyz.zhouxy.plusone.validator.ValidTools;
-
-class BaseValidatorTest {
-    @Test
-    void testValidate() {
-        RegisterCommand registerCommand = new RegisterCommand("zhouxy108", "luquanlion@outlook.com", "22336",
-                "A1b2C3d4",
-                "A1b2C3d4",
-                Arrays.asList(new String[] { "admin", "editor" }),
-                2000);
-        RegisterCommandValidator.INSTANCE.validate(registerCommand);
-        ValidTools.validate(registerCommand, RegisterCommandValidator.INSTANCE);
-        System.out.println(registerCommand);
-    }
-
-    static class RegisterCommandValidator extends BaseValidator<RegisterCommand> {
-
-        static final RegisterCommandValidator INSTANCE = new RegisterCommandValidator();
-
-        private RegisterCommandValidator() {
-           int thisYear = Year.now().getValue();
-
-            ruleForString(RegisterCommand::getUsername)
-                    .must(PredicateTools.<String>from(Objects::nonNull)
-                            .and(StringTools::isNotEmpty)
-                            .and(StringTools::isNotBlank)
-                            .and(username -> RegexTools.matches(username, PatternConsts.USERNAME)),
-                            username -> new IllegalArgumentException(String.format("用户名【%s】不符合规范", username)));
-            ruleForString(RegisterCommand::getAccount)
-                    .notNull("请输入邮箱地址或手机号")
-                    .matchesOne(Arrays.asList(PatternConsts.EMAIL, PatternConsts.MOBILE_PHONE), "请输入邮箱地址或手机号");
-            ruleForString(RegisterCommand::getCode)
-                    .notNull("验证码不能为空")
-                    .matches(PatternConsts.CAPTCHA, "验证码不符合规范");
-            ruleForString(RegisterCommand::getPassword)
-                    .notEmpty("密码不能为空")
-                    .matches(PatternConsts.PASSWORD, "密码不符合规范");
-            ruleForCollection(RegisterCommand::getRoles)
-                    .notEmpty(() -> new RuntimeException("角色列表不能为空"));
-
-            ruleForComparable(RegisterCommand::getYearOfBirth)
-                    .notNull()
-                    .inRange(Range.closed(thisYear - 60, thisYear - 18));
-
-            ruleForInt(RegisterCommand::getYearOfBirth)
-                    .notNull()
-                    .inRange(Range.closed(thisYear - 60, thisYear - 18));
-
-            withRule(registerCommand -> Objects.equals(registerCommand.getPassword(), registerCommand.getPassword2()),
-                    "两次输入的密码不一致");
-        }
-    }
-
-    /**
-     * RegisterCommand
-     */
-    static class RegisterCommand {
-
-        private String username;
-        private String account;
-        private String code;
-        private String password;
-        private String password2;
-        private List<String> roles;
-
-        private Integer yearOfBirth;
-
-        public RegisterCommand() {
-        }
-
-        public RegisterCommand(String username, String account, String code, String password, String password2,
-                List<String> roles, Integer yearOfBirth) {
-            this.username = username;
-            this.account = account;
-            this.code = code;
-            this.password = password;
-            this.password2 = password2;
-            this.roles = roles;
-            this.yearOfBirth = yearOfBirth;
-        }
-
-        public String getUsername() {
-            return username;
-        }
-
-        public void setUsername(String username) {
-            this.username = username;
-        }
-
-        public String getAccount() {
-            return account;
-        }
-
-        public void setAccount(String account) {
-            this.account = account;
-        }
-
-        public String getCode() {
-            return code;
-        }
-
-        public void setCode(String code) {
-            this.code = code;
-        }
-
-        public String getPassword() {
-            return password;
-        }
-
-        public void setPassword(String password) {
-            this.password = password;
-        }
-
-        public String getPassword2() {
-            return password2;
-        }
-
-        public void setPassword2(String password2) {
-            this.password2 = password2;
-        }
-
-        public List<String> getRoles() {
-            return roles;
-        }
-
-        public void setRoles(List<String> roles) {
-            this.roles = roles;
-        }
-
-        public Integer getYearOfBirth() {
-            return yearOfBirth;
-        }
-
-        public void setYearOfBirth(Integer yearOfBirth) {
-            this.yearOfBirth = yearOfBirth;
-        }
-
-        @Override
-        public String toString() {
-            return new StringBuilder()
-                    .append("RegisterCommand [")
-                    .append("username=").append(username)
-                    .append(", account=").append(account)
-                    .append(", code=").append(code)
-                    .append(", password=").append(password)
-                    .append(", password2=").append(password2)
-                    .append(", roles=").append(roles)
-                    .append(", yearOfBirth=").append(yearOfBirth)
-                    .append("]")
-                    .toString();
-        }
-    }
-}