perf: 简单优化代码

plusone-commons/src/main/java/xyz/zhouxy/plusone/commons/util/EnumTools.java

@@ -154,7 +154,7 @@ public final class EnumTools {
      */
     @Nullable
     public static <E extends Enum<?>> Integer checkOrdinalNullable(Class<E> enumType, @Nullable Integer ordinal) {
-        return checkOrdinalOrDefault(enumType, ordinal, (Integer) null);
+        return checkOrdinalOrDefault(enumType, ordinal, null);
     }
 
     /**

plusone-commons/src/main/java/xyz/zhouxy/plusone/commons/util/Enumeration.java

@@ -33,6 +33,7 @@ import xyz.zhouxy.plusone.commons.annotation.StaticFactoryMethod;
 /**
  * 枚举类
  *
+ * <p>
  * 参考 <a href="https://lostechies.com/jimmybogard/2008/08/12/enumeration-classes/">Enumeration classes</a>
  *
  * @author ZhouXY108 <luquanlion@outlook.com>

plusone-commons/src/main/java/xyz/zhouxy/plusone/commons/util/RandomTools.java

@@ -36,7 +36,7 @@ public final class RandomTools {
     private static final SecureRandom DEFAULT_SECURE_RANDOM;
 
     static {
-        SecureRandom secureRandom = null;
+        SecureRandom secureRandom;
         try {
             secureRandom = SecureRandom.getInstanceStrong(); // 获取高强度安全随机数生成器
         }

plusone-commons/src/main/java/xyz/zhouxy/plusone/commons/util/RegexTools.java

@@ -363,7 +363,7 @@ public final class RegexTools {
             this.flags = flags;
         }
 
-        private final Pattern compilePattern() {
+        private Pattern compilePattern() {
             return Pattern.compile(regex, flags);
         }
 

plusone-commons/src/main/java/xyz/zhouxy/plusone/commons/util/StringTools.java

@@ -177,6 +177,9 @@ public class StringTools {
      */
     @Beta
     public static boolean isURL(@Nullable final String cs) {
+        if (cs == null) {
+            return false;
+        }
         try {
             new URL(cs);
         } catch (MalformedURLException e) {