import java.util.function.Predicate; public class DemoPredicate { public static void main(String[] args) { //条件判断 doTest(s -> s.length() > 5); //逻辑非 doNegate(s -> s.length() > 5); //逻辑与 boolean isValid = doAnd(s -> s.contains("H"),s-> s.contains("w")); System.out.println("逻辑与的结果："+isValid); //逻辑或 isValid = doOr(s -> s.contains("H"),s-> s.contains("w")); System.out.println("逻辑或的结果："+isValid); } private static void doTest(Predicate<String> predicate) { boolean veryLong = predicate.test("Hello World"); System.out.println("字符串长度很长吗：" + veryLong); } private static boolean doAnd(Predicate<String> resource, Predicate<String> target) { boolean isValid = resource.and(target).test("Hello world"); return isValid; } private static boolean doOr(Predicate<String> one, Predicate<String> two) { boolean isValid = one.or(two).test("Hello world"); return isValid; } private static void doNegate(Predicate<String> predicate) { boolean veryLong = predicate.negate().test("Hello World"); System.out.println("字符串长度很长吗：" + veryLong); } }