Java.util.ArrayDeque.add() Method

Description

The java.util.ArrayDeque.add(E e) method inserts the specified element E at the end of the deque. This method is equivalent to addLast(E).

Declaration

Following is the declaration for java.util.ArrayDeque.add() method

public boolean add(E e)

Parameters

• e -- The element to be added in the deque.

Return Value

This method returns true if given element is added successully into the deque, otherwise it returns false.

Exception

• NullPointerException -- if the specified element is null.

Example

The following example shows the usage of java.util.ArrayDeque.add(E) method.

package com.tutorialspoint;

import java.util.ArrayDeque;
import java.util.Deque;

public class ArrayDequeDemo {
   public static void main(String[] args) {
      //
      // create an empty array deque with an initial capacity
      //
      Deque<Integer> deque = new ArrayDeque<Integer>(5);

      // use add() method to add elements in the deque
      deque.add(20);
      deque.add(30);
      deque.add(20);
      deque.add(30);
      deque.add(15);        
      deque.add(22);
      deque.add(11);

      // let us print all the elements available in deque
      for (Integer number : deque) {
         System.out.println("Number = " + number);
      }
   }
}

Let us compile and run the above program, this will produce the following result:

Number = 20
Number = 30
Number = 20
Number = 30
Number = 15
Number = 22
Number = 11