#    
An **#key# ArrayDeque: Array Double Ended Queue #key#** is a growable array that allows us to add or remove an element from both the front and back. 

This class is the implementation class of the `Deque` interface. `ArrayDeque` can be used as both Stack or Queue. 

>`null` elements are prohibited. 

The **` offer`** method can be used to add an element to the end of the `ArrayDeque` object.

## Syntax 

```java
public boolean offer(E e)
```


## Parameters

The `offer` method takes the element to be added to the `Deque` as a parameter. This method throws `NullPointerException` if the argument is `null`.

## Return value

The `offer` method returns `true` if the element is added to the `Deque`. Otherwise, `false` is returned.

## Code 

The code below demonstrates how to use the `offer` method:

import java.util.ArrayDeque;
class Offer {
    public static void main( String args[] ) {
      ArrayDeque<String> arrayDeque = new ArrayDeque<>();
      arrayDeque.offer("1");
      System.out.println("The arrayDeque is " + arrayDeque);

      arrayDeque.offer("2");
      System.out.println("The arrayDeque is " + arrayDeque);

    }
}

## Explanation 

In the above code:

* In line 1, we import the `ArrayDeque` class.

* In line 4, we create a `ArrayDeque` 
 object with the name `arrayDeque`. 

* In line 5, we use the `offer` method of the `arrayDeque` object to add an element (`"1"`) to the end of the `Deque`. Then, we print it. 


* In line 8, we use the `offer` method to add an element (`"2"`) to the end of the `Deque`. Finally, we print it.



What is the ArrayDeque.offer method in Java?

ArrayDeque's offer method adds an element to the end, returning true if successful and throwing NullPointerException if the element is null.