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## java.lang
Class NullPointerException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              java.lang.RuntimeException
                  java.lang.NullPointerException

    public class NullPointerException

extends RuntimeException

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.

Since:
  JDK1.0, CLDC 1.0
Version:
  12/17/01 (CLDC 1.1)

Constructor Summary
`NullPointerException()` Constructs a `NullPointerException` with no detail message.
`NullPointerException(String s)` Constructs a `NullPointerException` with the specified detail message.

Method Summary

Methods inherited from class java.lang.Throwable
`getMessage, printStackTrace, toString`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Constructor Detail

### NullPointerException

    public NullPointerException()

  Constructs a `NullPointerException` with no detail message.

### NullPointerException

    public NullPointerException(String s)

  Constructs a `NullPointerException` with the specified detail message.

  Parameters:
    `s` - the detail message.

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