Stream流运算

public class TestStream {
/*题目：
 * 筛选：
 * 1.ID必须是偶数
 * 2.年龄必须大于20
 * 3.用户名转换成小写
 * 4.用户名字母倒着排序
 * 5.只输出一个用户
 */
    public static void main(String[] args) {
        User user1 = new User(1,"A",18);
        User user2 = new User(2,"B",22);
        User user3 = new User(3,"C",20);
        User user4 = new User(4,"D",25);
        User user5 = new User(5,"E",16);
        User user6 = new User(7,"F",21);
        
        //集合就是存储
        List<User> list = Arrays.asList(user1,user2,user3,user4,user5,user6);
        
        //计算交给流
//        list.stream().filter((user)->{return user.getId()%2 == 0;});
        list.stream()
            .filter(user->user.getId()%2 == 0)
            .filter(user->user.getAge()>20)
            .map((user)->{return user.getName().toLowerCase();})
            .sorted((user11,user22)-> {return user22.compareTo(user11);})
            .limit(1)
            .forEach(System.out::println);                
    }

}