nullpointerexception.java

已经移植好的java虚拟机

/*
 * Copyright 1994-2002 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * This software is the proprietary information of Sun Microsystems, Inc.  
 * Use is subject to license terms.
 * 
 */

package java.lang;

/**
 * Thrown when an application attempts to use <code>null</code> in a 
 * case where an object is required. These include: 
 * <ul>
 * <li>Calling the instance method of a <code>null</code> object. 
 * <li>Accessing or modifying the field of a <code>null</code> object. 
 * <li>Taking the length of <code>null</code> as if it were an array. 
 * <li>Accessing or modifying the slots of <code>null</code> as if it 
 *     were an array. 
 * <li>Throwing <code>null</code> as if it were a <code>Throwable</code> 
 *     value. 
 * </ul>
 * <p>
 * Applications should throw instances of this class to indicate 
 * other illegal uses of the <code>null</code> object. 
 *
 * @author  unascribed
 * @version 1.15, 12/04/99 (CLDC 1.0, Spring 2000)
 * @since   JDK1.0, CLDC 1.0
 */
public
class NullPointerException extends RuntimeException {
    /**
     * Constructs a <code>NullPointerException</code> with no detail message.
     */
    public NullPointerException() {
	super();
    }

    /**
     * Constructs a <code>NullPointerException</code> with the specified 
     * detail message. 
     *
     * @param   s   the detail message.
     */
    public NullPointerException(String s) {
	super(s);
    }
}