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package java.lang;

 * 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 {@code NullPointerException} with no detail message.
    public NullPointerException() {

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