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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()

This method does not take any parameter

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.io.*;
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
        set.add("Welcome");
        set.add("To");
        set.add("Geeks");
        set.add("4");
        set.add("Geeks");

        // 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
        set.clear();

        // 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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