/**
 * @author Melvin Fitting
 * @version Mar 5, 2008
 *
 */
public interface Stack {

	/**
	 * 
	 * @return true if stack empty, false else
	 */
	public boolean isEmpty();
	
	/**
	 * 
	 * @return int on top of stack
	 * @throws StackException if stack empty
	 */
	public int peek() throws StackException;
	
	/**
	 * shortens stack by one item
	 * 
	 * @return int on top of stack
	 * @throws StackException if stack empty
	 */
	public int pop() throws StackException;
	
	/**
	 * 
	 * @param item is added to stack on top
	 */
	public void push(int item);
}