Display all elements in a Java HashSet

This java example shows how to display all elements in a Java HashSet object using Iterator and for-each loop.

import java.util.HashSet;
import java.util.Iterator;

public class DisplayAllElementsInHashSetExample {

 public static void main(String[] args) {

  // create an HashSet object

  HashSet hashSet = new HashSet();

  // Add elements to HashSet

  hashSet.add(1);
  hashSet.add(2);
  hashSet.add(3);

  System.out.println("HashSet contains : ");

  System.out.println("Display elements using Iterator.");

  Iterator i = hashSet.iterator();
  while (i.hasNext()) {
   System.out.println(i.next());
  }

  System.out
    .println("Display elements using for-each loop(available since jdk1.5)");

  for (Object e : hashSet) {

   System.out.println(e);
  }

 }

}

The output is:




HashSet contains :
Display elements using Iterator.
1
2
3
Display elements using for-each loop(available since jdk1.5)
1
2
3