1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
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7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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24  */
25 
26 package java.lang;
27 
28 /**
29  * Thrown when an application attempts to use {@code null} in a
30  * case where an object is required. These include:
31  * <ul>
32  * <li>Calling the instance method of a {@code null} object.
33  * <li>Accessing or modifying the field of a {@code null} object.
34  * <li>Taking the length of {@code null} as if it were an array.
35  * <li>Accessing or modifying the slots of {@code null} as if it
36  *     were an array.
37  * <li>Throwing {@code null} as if it were a {@code Throwable}
38  *     value.
39  * </ul>
40  * <p>
41  * Applications should throw instances of this class to indicate
42  * other illegal uses of the {@code null} object.
43  *
44  * {@code NullPointerException} objects may be constructed by the
45  * virtual machine as if {@linkplain Throwable#Throwable(String,
46  * Throwable, boolean, boolean) suppression were disabled and/or the
47  * stack trace was not writable}.
48  *
49  * @author  unascribed
50  * @since   JDK1.0
51  */
52 public
53 class NullPointerException extends RuntimeException {
54     private static final long serialVersionUID = 5162710183389028792L;
55 
56     /**
57      * Constructs a {@code NullPointerException} with no detail message.
58      */
NullPointerException()59     public NullPointerException() {
60         super();
61     }
62 
63     /**
64      * Constructs a {@code NullPointerException} with the specified
65      * detail message.
66      *
67      * @param   s   the detail message.
68      */
NullPointerException(String s)69     public NullPointerException(String s) {
70         super(s);
71     }
72 }
73