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Showing content from https://www.geeksforgeeks.org/java/concurrentlinkeddeque-isempty-method-in-java-with-examples/ below:

ConcurrentLinkedDeque isEmpty() method in Java with Examples

Last Updated : 11 Jul, 2025

The

java.util.concurrent.ConcurrentLinkedDeque.isEmpty()

is an in-built function in Java which checks whether the deque contains elements or not.

Syntax:

public boolean isEmpty()

Parameters:

The function does not accepts any parameter.

Return:

This method returns a

boolean value

stating whether this deque is empty or not. Below programs illustrate the ConcurrentLinkedDeque.isEmpty() method:

Example: 1 Java


 // Java Program Demonstrate
// isEmpty() method of ConcurrentLinkedDeque

import java.util.concurrent.*;

class ConcurrentLinkedDequeDemo {
    public static void main(String[] args)
    {
        ConcurrentLinkedDeque<String> cld
            = new ConcurrentLinkedDeque<String>();

        // Displaying the existing LinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);

        // Check if the queue is empty
        // using isEmpty() method
        System.out.println("Is deque empty: "
                           + cld.isEmpty());
    }
}

Output:

ConcurrentLinkedDeque: []
Is deque empty: true

Example: 2 Java


 // Java Program Demonstrate
// isEmpty() method of ConcurrentLinkedDeque

import java.util.concurrent.*;

class ConcurrentLinkedDequeDemo {
    public static void main(String[] args)
    {
        ConcurrentLinkedDeque<String> cld
            = new ConcurrentLinkedDeque<String>();

        cld.add("GFG");
        cld.add("Gfg");
        cld.add("GeeksforGeeks");
        cld.add("Geeks");

        // Displaying the existing LinkedDeque
        System.out.println("ConcurrentLinkedDeque: "
                           + cld);

        // Check if the queue is empty
        // using isEmpty() method
        System.out.println("Is deque empty: "
                           + cld.isEmpty());
    }
}

Output:

ConcurrentLinkedDeque: [GFG, Gfg, GeeksforGeeks, Geeks]
Is deque empty: false

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