DoublyLinkedList

I have an assignment to implement a Dequeue as doublyLinkedList (with methods insert left, and delete right) without a header, and not as a circular linked list

Here is what I have, seems to simple though:

Code:

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public class Dequeue {
 DoublyLinkedList dll;
 public Dequeue(){
 dll = new DoublyLinkedList();
 }
 public void insertLeft(Object o){
    dll.insertFirst(o);
 }
 public void deleteLeft(){
    dll.deleteFirst();
 }
 public void insertRight(Object o){
    dll.insertLast(o);
 }
 public void deleteRight(){
    dll.deleteLast();
 }
}

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Did you write the DoublyLinkedList class yourself?
Does the DoublyLinkedList class have any error checking? If not you will have to add it to your Dequeue class. By error checking I mean what happens when you call deleteLeft on an empty List?

Does it work?
You need to write a test driver to add items to the list and manipulate the list.