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- java.lang.Object
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- java.lang.Throwable
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- java.lang.Exception
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- java.lang.RuntimeException
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- java.lang.NullPointerException
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- All Implemented Interfaces:
- Serializable
public class NullPointerException extends RuntimeException
Thrown when an application attempts to usenull
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 aThrowable
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:
- JDK1.0
- See Also:
- Serialized Form
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Constructor Summary
Constructors Constructor and Description NullPointerException()
Constructs aNullPointerException
with no detail message.NullPointerException(String s)
Constructs aNullPointerException
with the specified detail message.
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Method Summary
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Methods inherited from class java.lang.Throwable
addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString
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Constructor Detail
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NullPointerException
public NullPointerException()
Constructs aNullPointerException
with no detail message.
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NullPointerException
public NullPointerException(String s)
Constructs aNullPointerException
with the specified detail message.- Parameters:
s
- the detail message.
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