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Java > Open Source Codes > java > lang > NullPointerException


1 /*
2  * @(#)NullPointerException.java 1.19 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 java.lang;
9
10 /**
11  * Thrown when an application attempts to use <code>null</code> in a
12  * case where an object is required. These include:
13  * <ul>
14  * <li>Calling the instance method of a <code>null</code> object.
15  * <li>Accessing or modifying the field of a <code>null</code> object.
16  * <li>Taking the length of <code>null</code> as if it were an array.
17  * <li>Accessing or modifying the slots of <code>null</code> as if it
18  * were an array.
19  * <li>Throwing <code>null</code> as if it were a <code>Throwable</code>
20  * value.
21  * </ul>
22  * <p>
23  * Applications should throw instances of this class to indicate
24  * other illegal uses of the <code>null</code> object.
25  *
26  * @author unascribed
27  * @version 1.19, 12/19/03
28  * @since JDK1.0
29  */
30 public
31 class NullPointerException extends RuntimeException JavaDoc {
32     /**
33      * Constructs a <code>NullPointerException</code> with no detail message.
34      */
35     public NullPointerException() {
36     super();
37     }
38
39     /**
40      * Constructs a <code>NullPointerException</code> with the specified
41      * detail message.
42      *
43      * @param s the detail message.
44      */
45     public NullPointerException(String JavaDoc s) {
46     super(s);
47     }
48 }
49
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