HashSet isEmpty() Method in Java

The Java.util.HashSet.isEmpty() method is used to check if a HashSet is empty or not. It returns True if the HashSet is empty otherwise it returns False.

Syntax:

Hash_Set.isEmpty()

Parameters: This method does not take any parameter

Return Value: The function returns True if the set is empty else returns False.

Below program illustrate the Java.util.HashSet.isEmpty() method:

// Java code to illustrate contains()
import java.io.*;
import java.util.HashSet;

public class HashSetDemo {
    public static void main(String args[])
    {
        // Creating an empty HashSet
        HashSet<String> set = new HashSet<String>();

        // Use add() method to add elements into the Set
        set.add("Welcome");
        set.add("To");
        set.add("Geeks");
        set.add("4");
        set.add("Geeks");

        // Displaying the HashSet
        System.out.println("HashSet: " + set);

        // Check for the empty set
        System.out.println("Is the set empty: " + set.isEmpty());

        // Clearing the set using clear() method
        set.clear();

        // Again Checking for the empty set
        System.out.println("Is the set empty: " + set.isEmpty());
    }
}

Output:

HashSet: [4, Geeks, Welcome, To]
Is the set empty: false
Is the set empty: true