// 16 write a java program to demonstrate HashSet
import java.util.*;
public class TestJavaCollection7{
  public static void main(String args[]){
    HashSet<String> set = new HashSet<String>();
    set.add("Ravi");
    set.add("Vijay");
    set.add("Ravi");
    set.add("Ajay");
    Iterator<String> itr = set.iterator();
    while(itr.hasNext()){
      System.out.println(itr.next());
    }
  }
}