/**
 * CSE 373, Spring 2012
 * An interface that defines the operations for PriorityQueue of integers.
 */
public interface PriorityQueue<E> {

	/**
	 * Inserts the specified value into this priority queue.
	 * @param value the value to insert into the priority queue
	 */
	public void add(E value);

	/**
	 * Returns true if this priority queue contains no elements.
	 * @return true if this collection contains no elements; false otherwise
	 */
	public boolean isEmpty();

	/**
	 * Retrieves, but does not remove, the value at the top of this priority queue.
	 * @return the value at the top of this priority queue
	 * @throws NoSuchElementException - if this queue is empty
	 */
	public E peek();

	/**
	 * Retrieves and removes the value at the top of this priority queue.
	 * @return the value at the top of this priority queue
	 * @throws NoSuchElementException - if this queue is empty
	 */
	public E remove();
}