/*
 * StackInterface.java 
 *
 * provides an interface for all of the funtions
 * a Stack should implement
 *
 * If a class implements this interface, it can
 * then be used as a Stack...
 */

interface StackInterface
{
  public boolean isEmpty();
  public Object peek();
  public Object pop();
  public void push(Object data);
  public String toString();
}