Stack.java

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00001 package com.graphbuilder.struc;
00002 
00003 public class Stack extends LinkedList {
00004 
00005     public Stack() {}
00006 
00007     public Object peek() {
00008         if (head == null)
00009             return null;
00010 
00011         return head.userObject;
00012     }
00013 
00014     public Object pop() {
00015         return removeHead();
00016     }
00017 
00018     public void push(Object o) {
00019         addToHead(o);
00020     }
00021 }