twosevenFourth/DequeADT.java at master · arabellastrange/twosevenFourth · GitHub

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public interface DequeADT<E> {
 /**
  * Returns the number of elements in the deque.
  */
  public int size();

 /**
  * Returns whether the deque is empty.
  */
  public boolean isEmpty();

 /**
  * Inserts an element to be the first in the deque.
  */
  public void addFirst (E element);

 /**
  * Inserts an element to be the last in the deque.
  */
  public void addLast (E element);

 /**
  * Returns the first element
  * @throws EmptyDequeException
  */
  public E getFirst();

 /**
  * Returns the last element;
  * @throws EmptyDequeException
  */
  public E getLast();


 /**
  * Removes the first element
  * @throws EmptyDequeException
  */
  public E removeFirst();

 /**
  * Removes the last element
  * @throws EmptyDequeException
  */
  public E removeLast();
}