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package java.lang;

Thrown when an application attempts to use null in a case where an object is required. These include: 

Calling the instance method of a null object. 
Accessing or modifying the field of a null object. 
Taking the length of null as if it were an array. 
Accessing or modifying the slots of null as if it were an array. 
Throwing null as if it were a Throwable value. 
 Applications should throw instances of this class to indicate other illegal uses of the null object. NullPointerException objects may be constructed by the virtual machine as if suppression were disabled and/or the
stack trace was not writable. 
Author:
 unascribed
Since:
  1.0/**
 * Thrown when an application attempts to use {@code null} in a
 * case where an object is required. These include:
 * <ul>
 * <li>Calling the instance method of a {@code null} object.
 * <li>Accessing or modifying the field of a {@code null} object.
 * <li>Taking the length of {@code null} as if it were an array.
 * <li>Accessing or modifying the slots of {@code null} as if it
 *     were an array.
 * <li>Throwing {@code null} as if it were a {@code Throwable}
 *     value.
 * </ul>
 * <p>
 * Applications should throw instances of this class to indicate
 * other illegal uses of the {@code null} object.
 *
 * {@code NullPointerException} objects may be constructed by the
 * virtual machine as if {@linkplain Throwable#Throwable(String,
 * Throwable, boolean, boolean) suppression were disabled and/or the
 * stack trace was not writable}.
 *
 * @author  unascribed
 * @since   1.0
 */
public
class NullPointerException extends RuntimeException {
    private static final long serialVersionUID = 5162710183389028792L;

    
Constructs a NullPointerException with no detail message. /**
     * Constructs a {@code NullPointerException} with no detail message.
     */
    public NullPointerException() {
        super();
    }

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