This documentation differs from the official API.
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java.lang
exception NullPointerException
- All Implemented Interfaces:
- Serializable
public exception 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.
Constructor Summary |
Constructs a NullPointerException with no detail message.
|
Constructs a NullPointerException with the specified
detail message.
|
Methods inherited from class java.lang.Throwable |
fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
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.
This documentation differs from the official API.
Jadeite adds
extra features to the API including:
variable font sizes,
constructions examples,
placeholders for classes and methods, and auto-generated “See Also” links.
Additionally it
is missing some items found in standard Javadoc documentation, including:
generics type information,
“Deprecated” tags and comments,
“See Also” links,
along with other minor differences.
Please send any questions or feedback to
bam@cs.cmu.edu.
This page displays the
Jadeite version of the documention, which is derived from the offical documentation that contains this copyright notice:
The official Sun™ documentation can be found here at
http://java.sun.com/javase/6/docs/api/.