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Java HashSet isEmpty() Method - GeeksforGeeks

Last Updated : 11 Jul, 2025

The HashSet isEmpty() in Java is used to check if the HashSet is empty or not.

boolean isEmpty()

Return Type: This method returns "true" if the HashSet is empty, otherwise returns "false".

Example: This example demonstrates how the isEmpty() method checks whether the given HashSet is empty or not.

// Java program to demonstrate the working of isEmpty()
import java.util.HashSet;

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

        System.out.println("HashSet: " + hs);
      
        // Check if the HashSet is empty
        System.out.println("Is the HashSet empty? "
                           + hs.isEmpty());

        // Add elements to the HashSet
        hs.add("Geek1");
        hs.add("Geek2");
        hs.add("Geek3");

        System.out.println("Updated HashSet: " + hs);
      
        // Check again if the HashSet is empty
        System.out.println("Is the HashSet empty? "
                           + hs.isEmpty());
    }
}

HashSet: []
Is the HashSet empty? true
Updated HashSet: [Geek3, Geek2, Geek1]
Is the HashSet empty? false

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