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      1 /*
      2  * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved.
      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
      6  * under the terms of the GNU General Public License version 2 only, as
      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.
     20  *
     21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     22  * or visit www.oracle.com if you need additional information or have any
     23  * questions.
     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      */
     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      */
     69     public NullPointerException(String s) {
     70         super(s);
     71     }
     72 }
     73