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/* NullPointerException.java -- exception thrown when attempting to use null |
/* NullPointerException.java -- thrown when using null instead of an object |
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where an object is required. |
Copyright (C) 1998, 1999, 2001, 2002 Free Software Foundation, Inc. |
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Copyright (C) 1998, 1999, 2001 Free Software Foundation, Inc. |
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This file is part of GNU Classpath. |
This file is part of GNU Classpath. |
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it under the terms of the GNU General Public License as published by |
it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
any later version. |
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GNU Classpath is distributed in the hope that it will be useful, but |
GNU Classpath is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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package java.lang; |
package java.lang; |
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3 |
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* "The Java Language Specification", ISBN 0-201-63451-1 |
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* plus online API docs for JDK 1.2 beta from http://www.javasoft.com. |
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* Status: Believed complete and correct. |
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*/ |
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/** |
/** |
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* Exceptions may be thrown by one part of a Java program and caught |
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* by another in order to deal with exceptional conditions. |
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* Thrown when attempting to use <code>null</code> where an object |
* Thrown when attempting to use <code>null</code> where an object |
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* is required, such as when accessing an instance method of a null object. |
* is required. The Virtual Machine automatically throws this exception |
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* for the following:<br><ul> |
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* <li>Calling an instance method on a null object</li> |
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* <li>Accessing or modifying a field of a null object</li> |
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* <li>Taking the array length of a null array</li> |
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* <li>Accessing or modifying the slots of a null array</li> |
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* <li>Throwing a null Throwable</li> |
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* <li>Synchronizing on a null object</li> |
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* </ul> |
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* <p>Applications should also throw NullPointerExceptions whenever |
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* <code>null</code> is an inappropriate parameter to a method. |
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* |
* |
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* @since JDK 1.0 |
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* |
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* @author Brian Jones |
* @author Brian Jones |
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* @author Warren Levy <warrenl@cygnus.com> |
* @author Warren Levy <warrenl@cygnus.com> |
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* @date September 18, 1998. |
* @status updated to 1.4 |
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*/ |
*/ |
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public class NullPointerException extends RuntimeException |
public class NullPointerException extends RuntimeException |
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{ |
{ |
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static final long serialVersionUID = 5162710183389028792L; |
/** |
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* Compatible with JDK 1.0+. |
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*/ |
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private static final long serialVersionUID = 5162710183389028792L; |
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/** |
/** |
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* Create an exception without a message. |
* Create an exception without a message. |
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*/ |
*/ |
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public NullPointerException() |
public NullPointerException() |
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{ |
{ |
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super(); |
} |
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} |
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/** |
/** |
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* Create an exception with a message. |
* Create an exception with a message. |
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* |
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* @param s the message |
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*/ |
*/ |
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public NullPointerException(String s) |
public NullPointerException(String s) |
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{ |
{ |
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super(s); |
super(s); |
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} |
} |
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} |
} |