Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://www.geeksforgeeks.org/java/hashset-clear-method-in-java/ below:

Java HashSet clear() Method - GeeksforGeeks

Last Updated : 11 Jul, 2025

The clear() method of the HashSet class in Java is used to clear all the elements from the HahSet. This method makes the HashSet empty but does not delete the HashSet itself. It simply removes all elements, leaving the set ready for reuse.

void clear()

Key Points:

• After calling clear() the HashSet size becomes 0.
• The clear() does not affect the internal capacity of the HashSet.

Example: This example demonstrates how the clear() method removes all the elements from the HashSet.

// Java program to demonstrates the working of clear()
import java.util.*;

public class Geeks {
    public static void main(String[] args)
    {
        // Create a HashSet
        HashSet<Integer> hs = new HashSet<Integer>();

        // Add elements to HashSet
        hs.add(1);
        hs.add(2);
        hs.add(3);

        System.out.println("HashSet before clear(): " + hs);

        // Clear the HashSet
        hs.clear();

        System.out.println("HashSet After clear(): " + hs);
        System.out.println("HashSet isEmpty(): "
                           + hs.isEmpty());
    }
}

HashSet before clear(): [1, 2, 3]
HashSet After clear(): []
HashSet isEmpty(): true

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4