1    /* 
2     * Stack.java 
3     * 
4     * Created on December 4, 2002 
5     */ 
6     
7    package collections.linkedlist; 
8     
9    import java.util.LinkedList; 
10    
11   /** 
12    * Shows how to use a LinkedList as a Stack. 
13    * @author  Thomas Rowland 
14    */ 
15   public class Stack { 
16    
17       private static LinkedList list = new LinkedList(); 
18    
19       public static void main(String[] args) { 
20           Stack stack = new Stack(); 
21           stack.push("good"); 
22           stack.push("bad"); 
23           stack.push("ugly"); 
24    
25           System.out.println(stack.peek()); 
26           System.out.println(stack.pop()); 
27           System.out.println(stack.pop()); 
28           System.out.println(stack.pop()); 
29       } 
30    
31       /** 
32        * push an object onto the top of the stack 
33        */ 
34       public void push(Object o) { 
35           list.addFirst(o); 
36       } 
37    
38       /** 
39        * pop an object off the top of the stack 
40        */ 
41       public Object pop() { 
42           return list.removeFirst(); 
43       } 
44    
45       /** 
46        * peek at an object on the top of the stack 
47        */ 
48       public Object peek() { 
49           return list.getFirst(); 
50       } 
51   } 
52