Queue Implementation using Deque

QueueDeque.java

/**
 * Author: Deepak Singhvi
 */
public class QueueDeque extends DequeueImpl {

  public static void main(String args[]) {
    QueueDeque queue = new QueueDeque();
    queue.enqueue(1);
    queue.enqueue(2);
    queue.enqueue(3);
    queue.enqueue(4);

    System.out.println(queue.dequeue());
    System.out.println(queue.toString());

  }

  public void enqueue(Integer element) {
    insertAtLast(element);
  }

  public Integer dequeue() {
    return removeFirst();
  }

  @Override
  public String toString() {
    return super.toString();
  }
}