/**
 * Base interface for queue implementations
 * CSE326b project 2.
 * @version Wi08
 */
public interface Queue<E> {
 /**
  * Report whether this queue is empty
  * @return  true if the queue has no elements
  */
 public boolean isEmpty();


 /**
  * Enqueue a new object to the queue
  * @param x Object to be enqueued.
  */
 public void enqueue(E x);


 /**
  * Get the least recently inserted item in the queue.
  * Does not alter the queue.
  *
  * @return  The front of the queue.
  * @exception NoSuchElementException thrown if queue is empty.
  */
 public E peek();


 /**
  * Remove and return the element in the front of the queue.
  *
  * @return  The front of the queue.
  * @exception NoSuchElementException thrown if queue is empty.
  */
 public E dequeue();


 /**
  * Delete all elements from the queue.
  */
 public void makeEmpty();

}