Write a program for Vector in collection framework

import java.util.ArrayList;

import java.util.Arrays;

import java.util.HashSet;

import java.util.List;

import java.util.ListIterator;

import java.util.Set;

import java.util.Vector;

public class VectorDemo {

   public static void main(String[] args)

   {

       Set set=new HashSet(Arrays.asList( "H", "E", "E", "R", "A" )); 

       String[] so=new String[set.size()];

       so=(String[])set.toArray(so);

       for (int i = 0; i < so.length; i++)

       {

           System.out.println(so[i]);

       }

       System.out.println(set);

   }   

}

output: