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Java > Open Source Codes > javax > swing > ListModel


1 /*
2  * @(#)ListModel.java 1.17 03/12/19
3  *
4  * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5  * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6  */
7
8 package javax.swing;
9
10 import javax.swing.event.ListDataListener JavaDoc;
11
12 /**
13  * This interface defines the methods components like JList use
14  * to get the value of each cell in a list and the length of the list.
15  * Logically the model is a vector, indices vary from 0 to
16  * ListDataModel.getSize() - 1. Any change to the contents or
17  * length of the data model must be reported to all of the
18  * ListDataListeners.
19  *
20  * @version 0.0 03/01/97
21  * @author Hans Muller
22  * @see JList
23  */
24 public interface ListModel
25 {
26   /**
27    * Returns the length of the list.
28    * @return the length of the list
29    */
30   int getSize();
31
32   /**
33    * Returns the value at the specified index.
34    * @param index the requested index
35    * @return the value at <code>index</code>
36    */
37   Object JavaDoc getElementAt(int index);
38
39   /**
40    * Adds a listener to the list that's notified each time a change
41    * to the data model occurs.
42    * @param l the <code>ListDataListener</code> to be added
43    */
44   void addListDataListener(ListDataListener JavaDoc l);
45
46   /**
47    * Removes a listener from the list that's notified each time a
48    * change to the data model occurs.
49    * @param l the <code>ListDataListener</code> to be removed
50    */
51   void removeListDataListener(ListDataListener JavaDoc l);
52 }
53
54
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