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Set isEmpty() method in Java with Examples

  • Last Updated : 31 Dec, 2018

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


boolean isEmpty()

Parameters: This method does not take any parameter

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

Below program illustrate the java.util.Set.isEmpty() method:

// Java code to illustrate isEmpty()
import java.util.*;
public class SetDemo {
    public static void main(String args[])
        // Creating an empty Set
        Set<String> set = new HashSet<String>();
        // Use add() method to add elements into the Set
        // Displaying the Set
        System.out.println("Set: " + set);
        // Check for the empty set
        System.out.println("Is the set empty? " + set.isEmpty());
        // Clearing the set using clear() method
        // Again Checking for the empty set
        System.out.println("Is the set empty? " + set.isEmpty());
Set: [4, Geeks, Welcome, To]
Is the set empty? false
Is the set empty? true


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