/**
 * CSE 373, Winter 2011, Jessica Miller
 * An interface that defines the operations for a PrioityQueue ADT for ints.
 */
public interface IntPriorityQueue {
    /** 
     * Adds an int to the priority queue.
     */    
    public void add(int value);

    /** 
     * Tests if the priority queue is empty.
     */    
    public boolean isEmpty();

    /**
     * Returns, but does not delete the element at the front of the priority
     * queue.
     * @return the minimum value in the priority queue
     * @throws IllegalStateException if priority queue is empty
     */        
    public int peek();

    /**
     * Deletes and returns the minimum element in the priority queue.
     * @return the minimum value in the priority queue
     * @throws IllegalStateException if priority queue is empty
     */    
    public int remove();
}