How to remove all element from Hashset.

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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