How to Remove All Elements from HashSet in Java


In this example, we will learn how to remove all elements contained in Java HashSet or clear HashSet object with clear or removeAll methods. We may also see how to check if HashSet object is empty with isEmpty method. In addition, we may use the clear() method in the HashSet class to remove all elements.

Source Code

package com.beginner.examples;

import java.util.HashSet;

public class RemoveAllElementOfHashSet {

	public static void main(String[] args) {
		// Create a HashSet object
		HashSet hSet = new HashSet();

		// Add Elements
		hSet.add("A");
		hSet.add("B");
		hSet.add("C");

		// Remove all
		hSet.clear();

		System.out.println("All deleted:"+hSet);

	}

}

Output:

All deleted:[]

References

Imported packages in Java documentation:

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