lambda中sorted排序

/**
     * lambda
     * sorted排序
     */
    @Test
    public void test19() {
        List<Integer> list = new ArrayList<>();
        list.add(1);
        list.add(11);
        list.add(111);
        list.add(9);
        List<Integer> collect = list.stream().sorted().collect(Collectors.toList());
        collect.forEach(System.out::println);
        System.out.println("********");
 
        List<Integer> reverseOrder = list.stream().sorted(Comparator.reverseOrder()).collect(Collectors.toList());
        reverseOrder.forEach(System.out::println);
    }

  List<User> user = new ArrayList<>();
        user.add(new User(1L, 18, "小明"));
        user.add(new User(2L, 20, "小王"));
        user.add(new User(3L, 28, "小刚"));
        user.add(new User(4l, 25, "小丽"));
        List<User> collect1 = user.stream().sorted(Comparator.comparing(User::getAge)).collect(Collectors.toList());
        collect1.forEach(e -> {
            System.out.println(JSON.toJSONString(e));
        });
        System.out.println("***************");
        List<User> collect2 = user.stream().sorted(Comparator.comparing(User::getAge).reversed()).collect(Collectors.toList());
        collect2.forEach(e -> {
            System.out.println(JSON.toJSONString(e));
        });

 //先按照age排序，age相同时按照id排序
        List<User> collect3 = user.stream().sorted(Comparator.comparing(User::getAge).thenComparing(User::getId)).collect(Collectors.toList());
        collect3.forEach(e -> {
            System.out.println(JSON.toJSONString(e));
        });