JUC练习11——四大函数式接口

一，基本介绍

Function函数型接口

R apply(T t);

Predicate断定型接口

boolean test(T t);

Consumer消费型接口

void accept(T t);

Supplier供给型接口

T get();

二，代码示例

 @Test
    public void test8()
    {
        Function function = new Function<>() {
            @Override
            public String apply(String s) {
                return s + "0";
            }
        };
        function = (str)->{return str+"0";};
        System.out.println(function.apply("a"));


        Predicate predicate = new Predicate<>() {
            @Override
            public boolean test(String str) {
                return str.isEmpty();
            }
        };
        predicate= (str)->{return str.isEmpty();};
        System.out.println(predicate.test(""));

        Consumer consumer = new Consumer<>() {
            @Override
            public void accept(String o) {
                System.out.println(o);
            }
        };
        consumer = (str)->{ System.out.println(str); };
        consumer.accept("a1");
        Supplier supplier = new Supplier<>() {
            @Override
            public String get() {
                return "result";
            }
        };
        supplier = ()->{return "a2";};
        System.out.println(supplier.get());
    }