Package Summary Overview Summary

### class:NullPointerException [NONE]
All Implemented Interfaces: `Serializable` 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. `NullPointerException` objects may be constructed by the virtual machine as if suppression were disabled and/or the stack trace was not writable . Since: 1.0 See Also: Serialized Form

### constructor:NullPointerException() [NONE]
### NullPointerException public NullPointerException() Constructs a `NullPointerException` with no detail message.

### constructor:NullPointerException(java.lang.String) [NONE]
### NullPointerException public NullPointerException (String s) Constructs a `NullPointerException` with the specified detail message. Parameters: `s` - the detail message.

### method:getMessage() [NONE]
### getMessage public String getMessage() Returns the detail message string of this throwable. If a non-null message was supplied in a constructor it is returned. Otherwise, an implementation specific message or `null` is returned. Overrides: `getMessage` in class `Throwable` Implementation Note: If no explicit message was passed to the constructor, and as long as certain internal information is available, a verbose description of the null reference is returned. The internal information is not available in deserialized NullPointerExceptions. Returns: the detail message string, which may be `null`.