Collection HashSet Class Java example

HashSet Class

A HashSet represents a set of  elements.it does not guarantee the order of elements.Also it does not allow the duplicate elements to be stored.

Default Initial Capacity= 16
Default Load Factor=0.75

HashSet Class Methods:

• boolean add(obj)
• boolean remove(obj)
• void clear()
• boolean contains(obj)
• boolean isEmpty()
• int size()

Program:

/**

 * 

 */

package com.collectionpack;

import java.util.HashSet;

import java.util.Iterator;

/**

 * @author Abhinaw.Tripathi

 *

 */

public class HashSetApp {

/**

* @param args

*/

public static void main(String[] args) {

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

hs.add("India");

hs.add("America");

hs.add("Japan");

hs.add("China");

System.out.println("HashSet =" + hs);

Iterator it=hs.iterator();

System.out.println("Elements using Iterator....");

while(it.hasNext())

{

String s=(String) it.next();

System.out.println(" "+s);

}

}

}

Output:

HashSet =[America, China, Japan, India]

Elements using Iterator....

 America

 China

 Japan

 India