Java Object Ordering mini-Test

import java.util.arraylist;import java.util.collections;import java.util.list;/** *  Java Object Sorting  */public class User implements Comparable<User> {     private int idx;    public user (INT&NBSP;IDX)  {         this.idx = idx;    }     public int getidx ()  {        return idx;     }    public void setidx (INT&NBSP;IDX)  {         this.idx = idx;    }     @Override     public string tostring ()  {         return  "user{"  +                 "Idx="  + idx +                  '} ';    }     @Override     public  int compareto (User o)  {        return idx  - o.idx;    }    public static void main ( String[] args)  {        User a1 = new  User (1);         user a2 = new user (2);         user a3 = new user (3);         user a4 = new user (4);         List<user> userlist = new arraylist<> (4);         userlist.add (A3);         userlist.add (A2);         userlist.add (A4);         userlist.add (A1);         collections.sort (userlist);   //Change the order of original set elements after sorting          for  (user user : userlist)  {             system.out.println (user);         }    }}

User{idx=1}user{idx=2}user{idx=3}user{idx=4}process finished with exit code 0

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Java Object Ordering mini-Test