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Java ArrayDeque isEmpty() Method with Example

ArrayDeque Class isEmpty() method: Here, we are going to learn about the isEmpty() method of ArrayDeque Class with its syntax and example.
Submitted by Preeti Jain, on January 10, 2020

ArrayDeque Class isEmpty() method

• isEmpty() Method is available in java.lang package.
• isEmpty() Method is used to check whether this deque is "empty" or "non-empty".
• isEmpty() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• isEmpty() Method does not throw an exception at the time of checking the empty status of this deque.

Syntax:

    public boolean isEmpty();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is boolean, it returns true if this queue is empty else it returns false.

Example:

// Java program to demonstrate the example 
// of boolean isEmpty() method of ArrayDeque 

import java.util.*;

public class IsEmptyOfArrayDeque {
    public static void main(String[] args) {
        // Creating an ArrayDeque with initial capacity of
        // storing elements
        Deque < String > d_queue = new ArrayDeque < String > (10);

        // By using add() method to add elements
        // in ArrayDeque
        d_queue.add("C");
        d_queue.add("C++");
        d_queue.add("Java");
        d_queue.add("Php");
        d_queue.add("DotNet");

        // Display Deque Elements
        System.out.println("d_queue : ");
        System.out.println("ArrayDeque Elements = " + d_queue);

        System.out.println();

        // By using isEmpty() method is to check the 
        // empty status of ArrayDeque
        boolean b = d_queue.isEmpty();
        System.out.println("d_queue.isEmpty() : " + b);
    }
}

Output

d_queue : 
ArrayDeque Elements = [C, C++, Java, Php, DotNet]

d_queue.isEmpty() : false