PROGRAM TO SHOW THE USE OF HasSet, Iterator AND for Loop

HashSet_Example.java

package com.alok;

import java.io.IOException;

import java.util.*;

public class HashSet_Example

{

public static void main(String[] args)throws IOException

{

String str[]={"alok","manish","Pravin","rajiv","pratyush"};

//create a HashSet to store above string

HashSet<String> hs= new HashSet<String>();

//Storing elements to HashSet

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

{

hs.add(str[i]);

}

System.out.println(hs);

//add an iterator to HashSet

Iterator<String> it= hs.iterator();

//Displaying elements using iterator

System.out.println("Retrieve Elements from HashSet using Iterator..");

while(it.hasNext())

{

String s=it.next();

System.out.println(s);

}

//Displaying Elements using For-each loop...

System.out.println("\nRetrieve Elements using for loop....");

for(String var:hs)

{

System.out.println(var);

}

}

}

OUTPUT

[manish, alok, Pravin, pratyush, rajiv]
Retrieve Elements from HashSet using Iterator..
manish
alok
Pravin
pratyush
rajiv

Retrieve Elements using for loop....
manish
alok
Pravin
pratyush
rajiv