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Java ArrayDeque offer() Method with Example

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

ArrayDeque Class offer() method

• offer() Method is available in java.lang package.
• offer() Method is used to add the given element at the end of the deque.
• offer() 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.
• offer() Method may throw an exception at the time of adding element in the deque.
  NullPointerException: This exception may throw when the given element is null exists.

Syntax:

    public boolean offer(T element);

Parameter(s):

• T element – represents the element to be inserted at the last of this deque.

Return value:

The return type of the method is boolean, it returns true if the given element is added last into the deque successfully, else it returns false.

Example:

// Java program to demonstrate the example 
// of boolean offer(T element) method of ArrayDeque 

import java.util.*;

public class OfferOfArrayDeque {
    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");

        System.out.println();

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

        System.out.println();

        // By using offer() method to add the
        // elements at the last in ArrayDeque
        d_queue.offer("Python");

        System.out.println("d_queue after offer(): ");
        // Display Deque Elements
        System.out.println("d_queue.offer() : " + d_queue);
    }
}

Output

d_queue before offer(): 
ArrayDeque Elements = [C, C++, Java, Php, DotNet]

d_queue after offer(): 
d_queue.offer() : [C, C++, Java, Php, DotNet, Python]