NullPointerException

Class Overview

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.

Summary

Public Constructors
	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.

Public Constructors

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.

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Inherited Methods

From class java.lang.Throwable

final void	addSuppressed(Throwable throwable) Adds `throwable` to the list of throwables suppressed by this.
Throwable	fillInStackTrace() Records the stack trace from the point where this method has been called to this `Throwable`.
Throwable	getCause() Returns the cause of this `Throwable`, or `null` if there is no cause.
String	getLocalizedMessage() Returns the detail message which was provided when this `Throwable` was created.
String	getMessage() Returns the detail message which was provided when this `Throwable` was created.
StackTraceElement[]	getStackTrace() Returns a clone of the array of stack trace elements of this `Throwable`.
final Throwable[]	getSuppressed() Returns the throwables suppressed by this.
Throwable	initCause(Throwable throwable) Initializes the cause of this `Throwable`.
void	printStackTrace(PrintStream err) Writes a printable representation of this `Throwable`'s stack trace to the given print stream.
void	printStackTrace(PrintWriter err) Writes a printable representation of this `Throwable`'s stack trace to the specified print writer.
void	printStackTrace() Writes a printable representation of this `Throwable`'s stack trace to the `System.err` stream.
void	setStackTrace(StackTraceElement[] trace) Sets the array of stack trace elements.
String	toString() Returns a string containing a concise, human-readable description of this object.

From class java.lang.Object

Object	clone() Creates and returns a copy of this `Object`.
boolean	equals(Object o) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of `Class` that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object.
final void	wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.
final void	wait(long millis) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires.

Public Constructors

public NullPointerException ()

Added in API level 1

Constructs a new NullPointerException that includes the current stack trace.

public NullPointerException (String detailMessage)

Added in API level 1

Constructs a new NullPointerException with the current stack trace and the specified detail message.

Parameters

detailMessage	the detail message for this exception.

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

Results

Annotations

Interfaces

Classes

Enums

Exceptions

Errors

Class Overview

Summary

Public Constructors

public NullPointerException ()

public NullPointerException (String detailMessage)

Parameters