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import java.util.function.Predicate; public class DemoPredicate { public static void main(String[] args) { //條件判斷 doTest(s -> s.length() > 5); //邏輯非 doNegate(s -> s.length() > 5); //邏輯與 boolean isValid = doAnd(s -> s.contains("H"),s-> s.contains("w")); System.out.println("邏輯與的結(jié)果："+isValid); //邏輯或 isValid = doOr(s -> s.contains("H"),s-> s.contains("w")); System.out.println("邏輯或的結(jié)果："+isValid); } private static void doTest(Predicate<String> predicate) { boolean veryLong = predicate.test("Hello World"); System.out.println("字符串長(zhǎng)度很長(zhǎng)嗎：" + 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("字符串長(zhǎng)度很長(zhǎng)嗎：" + veryLong); } }