NullPointerException

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

All Implemented Interfaces:

Serializable, Modified
```
public class NullPointerException
extends RuntimeException
```
Thrown when a program tries to access a field or method of an object or an element of an array when there is no instance or array to use, that is if the object or array points to null. It also occurs in some other, less obvious circumstances, like a throw e statement where the Throwable reference is null.

See Also:

Serialized Form

Field Summary
- Fields inherited from class java.lang.Throwable
  addr, message

Constructor Summary

Constructors
Constructor	Description
`NullPointerException()`	Constructs a new `NullPointerException` that includes the current stack trace.
`NullPointerException(String detailMessage)`	Constructs a new `NullPointerException` with the current stack trace and the specified detail message.

Method Summary
- Methods inherited from class java.lang.Throwable
  getMessage, printStackTrace, printStackTrace, toString
- Methods inherited from class java.lang.Object
  equals, getClass, hashCode

- Constructor Detail
  - NullPointerException
```
public NullPointerException()
```
    Constructs a new NullPointerException that includes the current stack trace.
  - NullPointerException
```
public NullPointerException(String detailMessage)
```
    Constructs a new NullPointerException with the current stack trace and the specified detail message.
    
    Parameters:
    
    detailMessage - the detail message for this exception.