用Predicate接口及逻辑运算测试条件

package _5_24;

 

import java.util.function.Predicate;

 

public class InterfacePredicate {

public static void main(String[] args) {

// Number type: check if greater than 5

Predicate<Integer> predicate = x -> x > 5;

System.out.println(predicate.test(10)); // true

 

// String type: check if empty

Predicate<String> predicateStr1 = x -> null == x || "".equals(x);

System.out.println(predicateStr1.test("")); // true

 

// String type: check if contains "b"

Predicate<String> predicateStr2 = s -> s.contains("b");

System.out.println(predicateStr1.and(predicateStr2).test("book")); // and

System.out.println(predicateStr1.or(predicateStr2).test("book")); // or

System.out.println(predicateStr2.negate().test("hello")); // negate

}

}