//按id从小到大List
     
       sortUser = list.stream().sorted((u1, u2) -> u1.getId().compareTo(u2.getId())).collect(Collectors.toList());按id从大到小List
      
        sortUser = list.stream().sorted((u1, u2) -> u2.getId().compareTo(u1.getId())).collect(Collectors.toList());
      
     

示例：

public class HelloWorld {    public static void main(String[] args) {        List
     
       list = new ArrayList<>();        for(int i=1;i<=10;i++) {            User u = new User(i, "用户-" + i);            list.add(u);        }        //按id从大到小排序        List
      
        sortUser = list.stream().sorted((u1, u2) -> u2.getId().compareTo(u1.getId())).collect(Collectors.toList());        System.out.println("排序后：" + sortUser);    }    private static class User{        Integer id;        String name;        public User(Integer id, String name) {            this.id = id;            this.name = name;        }        public Integer getId() {            return id;        }        public void setId(Integer id) {            this.id = id;        }        public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        @Override        public String toString() {            return "User{" +                    "id=" + id +                    ", name='" + name + '\'' +                    '}';        }    }}
      
     

执行结果：

[User {    id = 10, name = '用户-10'}, User {    id = 9, name = '用户-9'}, User {    id = 8, name = '用户-8'}, User {    id = 7, name = '用户-7'}, User {    id = 6, name = '用户-6'}, User {    id = 5, name = '用户-5'}, User {    id = 4, name = '用户-4'}, User {    id = 3, name = '用户-3'}, User {    id = 2, name = '用户-2'}, User {    id = 1, name = '用户-1'}]