LinkedHashSet and HashSet

package justtest;

import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.Set;

public class TestSet {

    public static void main(String[] args) {

     /** Create set that retains Order-of-Insertion */
      Set set = new LinkedHashSet();
      set.add("1");
      set.add("2");
      set.add("3");
      set.add("2");
      for (Iterator it = set.iterator(); it.hasNext();) {
          System.out.println(it.next()); //1,2,3
      }

      /** Create set that does not retain Order-of-Insertion */
      Set set2 = new HashSet();
      set2.add("1");
      set2.add("2");
      set2.add("3");
      set2.add("2");
      set2.add("3");
      for (Iterator it = set2.iterator(); it.hasNext();) {
          System.out.println(it.next()); //3,2,1
      }
   }
}