listDemo

package test1;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class ListExample {

 public static void main(String[] args) {

  new ListExample().testList();

 }

 private void testList() {

  List<Mother> list = new ArrayList<>();

  list.add(new Mother("1"));
  list.add(new Mother("3"));
  list.add(new Mother("2"));

  sortList(list);

  printLIst(list);
 }

 private void printLIst(List<Mother> list) {
  for (Mother obj : list) {
   System.out.println(obj);
   // obj.speak();
  }
 }

 private void sortList(List<Mother> list) {
  Collections.sort(list);
 }

 public class Mother implements Comparable<Mother> {

  public Mother(String name2) {
   this.name = name2;
  }

  public String name;
  String foot;
  String mouth = " ";

  void speak() {
   System.out.println(name + " is speaking.... hahahahaha....");
  }

  @Override
  public String toString() {
   return name + mouth;

  }

  @Override
  public int compareTo(Mother o) {
   return -this.name.compareTo(o.name);
  }

 }

}