修改类名，与 guava 的 Predicates 区分。

src/main/java/xyz/zhouxy/plusone/commons/function/PredicateTools.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2022-2023 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.commons.function;
+
+import java.util.function.Predicate;
+
+/**
+ * Predicates
+ *
+ * <p>
+ * {@link Predicate} 相关操作。
+ * </p>
+ *
+ * @author <a href="https://gitee.com/zhouxy108">ZhouXY</a>
+ * @since 0.1.0
+ * @see Predicate
+ */
+public class PredicateTools {
+
+    /**
+     * 将 lambda 表达式或者方法引用指明为对应类型的 {@link Predicate} 对象。
+     * 如将 {@code Objects::nonNull} 明确地指定为 {@code Predicate&lt;String&gt;}，
+     * 使之可以链式调用 {@link Predicate#and(Predicate)}、{@link Predicate#or(Predicate)}
+     * 等方法，连接其它 {@code Predicate<? super T>} 对象。
+     * 
+     * <pre>
+     * Predicate&lt;String&gt; predicate = PredicateTools.&lt;String&gt;from(Objects::nonNull)
+     *         .and(StringUtils::isNotEmpty);
+     * </pre>
+     * 
+     * @param <T>       目标类型
+     * @param predicate Lambda 表达式
+     * @return 传入的表达式自动成为 {@link Predicate} 实例
+     */
+    public static <T> Predicate<T> from(Predicate<T> predicate) {
+        return predicate;
+    }
+
+    private PredicateTools() {
+        throw new IllegalStateException("Utility class");
+    }
+}