JDK8_Lambda

@Test
    public void test1(){
        Runnable runnable1 = new Runnable() {
            @Override
            public void run() {
                System.out.println("I like to drink juice");
            }
        };
        runnable1.run();

        //使用Lambda
        Runnable runnable2 = () -> System.out.println("I like to eat bread");
        runnable2.run();
    }

    //使用java内置的函数式接口举例
    //Predicate : 过滤
    @Test
    public void test2(){
        List<String> list = Arrays.asList("北京", "南京", "西安", "东京", "普京");
        /*List<String> stringList = filterString(list, new Predicate<String>() {
            @Override
            public boolean test(String s) {
                return s.contains("京");
            }
        });
        System.out.println(stringList);*/

        List<String> stringList =filterString(list,s -> s.contains("京"));
        System.out.println(stringList);
    }

    public List<String> filterString(List<String> list, Predicate<String> predicate){
        ArrayList<String> stringArrayList = new ArrayList<>();
        for (String s : list) {
            if (predicate.test(s)){
                stringArrayList.add(s);
            }
        }
        return stringArrayList;
    }