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How to remove all element from Hashset.

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How to remove all element from Hashset.

How to remove all element from Hashset.

HashSet is set type Collection. It supports only unique value. We can not store duplicate value in  it .
In this example, you will see the use of clear method of HashSet. It is used to remove all element of hashset.

Code

HashSetRemoveElement.java

package net.roseindia;

import java.util.HashSet;

public class RemoveAllElement {

public static void main(String[] arg) {

HashSet obHashSet = new HashSet();

obHashSet.add(new Integer(1));

obHashSet.add(new Integer(2));

obHashSet.add(new Integer(3));

obHashSet.add(new Integer(4));

System.out.println("Element before clear method : " + obHashSet);

obHashSet.clear();

System.out.println("Check HashSet : " + obHashSet.isEmpty());

System.out.println("Element after clear method : " + obHashSet);

}

}

Output :

Element before clear method : [1, 2, 3, 4]

Check HashSet : true

Element after clear method : []

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Posted on: April 4, 2011 If you enjoyed this post then why not add us on Google+? Add us to your Circles

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