Java Program toFind duplicates and unique set

Example Input :

  an array of String contains :String[] str = new String[] {"alok", "dhoni", "manish", "rajiv", "alok", "rajiv"}

output : 

 unique items: [manish, dhoni]
Duplicate items : [alok, rajiv]

 SetExampl.java 

package com.alok.Uniqueduplicate;

import java.util.HashSet;

import java.util.Set;

public class SetExample

{

    public static void main(String[] args)

    {

    String[] str = new String[] {"alok", "dhoni", "manish", "rajiv", "alok", "rajiv"};

    Set<String> duplicateSet = new HashSet<String>();

    Set<String> uniqueSet = new HashSet<String>();

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

        {

            if(!uniqueSet.add(str[i]))

            {

                duplicateSet.add(str[i]);

            }

        }

        uniqueSet.removeAll(duplicateSet);

        System.out.println("unique items: "+uniqueSet);

        System.out.println("Duplicate items : "+ duplicateSet);

    }

}

output : 

unique items: [manish, dhoni]
Duplicate items : [alok, rajiv]