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Copyright © 2006 Sun Microsystems, Inc. All rights reserved.
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
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.
Copyright © 2006 Sun Microsystems, Inc. All rights reserved. Use is subject to License Terms. Your use of this web site or any of its content or software indicates your agreement to be bound by these License Terms.
For more information, please consult the JSR 37 specification.