package EDU.cmu.cs.coral.util;// uncomment next line if you are using JDK 1.1//import com.sun.java.util.collections.*;// uncomment next line if you are using JDK 1.2 or laterimport java.util.*;/** * This is an abstract definition of a Priority Queue. * <P> * Copyright (c)2000 William Uther * * @author William Uther (will@cs.cmu.edu) * @version $Revision: 1.2 $ */public interface PriorityQueue extends Collection {	Comparator comparator();	Object peekMin();	Object removeMin();	boolean alteredKey(Object o);}