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29 * Thrown when an application attempts to use {@code null} in a
30 * case where an object is required. These include:
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
37 * <li>Throwing {@code null} as if it were a {@code Throwable}
41 * Applications should throw instances of this class to indicate
42 * other illegal uses of the {@code null} object.
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}.
53 class NullPointerException extends RuntimeException {
54 private static final long serialVersionUID = 5162710183389028792L;
57 * Constructs a {@code NullPointerException} with no detail message.
59 public NullPointerException() {
64 * Constructs a {@code NullPointerException} with the specified
67 * @param s the detail message.
69 public NullPointerException(String s) {