Queue


1   /*
2    * @(#)Queue.java   1.0 02/02/01
3    *
4    * Copyright (C) 2001 Gaudenz Alder
5    *
6    * This library is free software; you can redistribute it and/or
7    * modify it under the terms of the GNU Lesser General Public
8    * License as published by the Free Software Foundation; either
9    * version 2.1 of the License, or (at your option) any later version.
10   *
11   * This library is distributed in the hope that it will be useful,
12   * but WITHOUT ANY WARRANTY; without even the implied warranty of
13   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14   * Lesser General Public License for more details.
15   *
16   * You should have received a copy of the GNU Lesser General Public
17   * License along with this library; if not, write to the Free Software
18   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19   *
20   */
21  
22  package hero.client.grapheditor;
23  
24  import java.util.Vector  ;
25  
26  /**
27   *  Class to implement a simple queue of integers.
28  
29   * </p>Here is the <a HREF="../algorithm/shawn/Queue.java">source</a>.
30   */
31  
32  public class Queue
33    {
34     private static int size;
35     Vector   array;
36  
37     public Queue()
38       {
39        array = new Vector  ();
40       }
41  
42     public int push(int item)
43       {
44        int num;
45        array.addElement(new Integer  (item));
46        num = array.size();
47        return num;
48       }
49  
50     public int pop()
51       {
52        int item;
53        item = ((Integer  )array.elementAt(0)).intValue();
54        array.removeElementAt(0);
55        return item;
56       }
57  
58     public boolean isEmpty()
59       {
60        return(array.isEmpty());
61       }
62    }
63
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