TreeSetExample

import java.util.*;

public class TreeSetExample{
  public static void main(String[] args) {

 TreeSet <Integer>tree = new TreeSet<Integer>();
 tree.add(12);
 tree.add(03);
 tree.add(41);
 tree.add(36);

 Iterator iterator = tree.iterator();


 while (iterator.hasNext()){
 System.out.print("++++>>>> "+iterator.next() + " ");
 }
  }
}

Console Result Is : 

++++>>>> 3 ++++>>>> 12 ++++>>>> 36 ++++>>>> 41