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## java.lang
Class RuntimeException

    java.lang.Object
      java.lang.Throwable
          java.lang.Exception
              java.lang.RuntimeException

All Implemented Interfaces:
  Serializable

Direct Known Subclasses:
  ArithmeticException, ArrayStoreException, BufferOverflowException, BufferUnderflowException, CannotRedoException, CannotUndoException, ClassCastException, CMMException, ConcurrentModificationException, DOMException, EmptyStackException, IllegalArgumentException, IllegalMonitorStateException, IllegalPathStateException, IllegalStateException, ImagingOpException, IndexOutOfBoundsException, MissingResourceException, NegativeArraySizeException, NoSuchElementException, NullPointerException, ProfileDataException, ProviderException, RasterFormatException, SecurityException, SystemException, UndeclaredThrowableException, UnmodifiableSetException, UnsupportedOperationException

public class RuntimeException
extends Exception

`RuntimeException` is the superclass of those exceptions that can be thrown during the normal operation of the Java Virtual Machine.

A method is not required to declare in its `throws` clause any subclasses of `RuntimeException` that might be thrown during the execution of the method but not caught.

Since:
  JDK1.0
See Also:
  Serialized Form

Constructor Summary
`RuntimeException()` Constructs a new runtime exception with `null` as its detail message.
`RuntimeException(String message)` Constructs a new runtime exception with the specified detail message.
`RuntimeException(String message, Throwable cause)` Constructs a new runtime exception with the specified detail message and cause.
`RuntimeException(Throwable cause)` Constructs a new runtime exception with the specified cause and a detail message of `(cause==null ? null : cause.toString())` (which typically contains the class and detail message of `cause`).

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, wait, wait, wait`

Constructor Detail

### RuntimeException

    public RuntimeException()

  Constructs a new runtime exception with `null` as its detail message. The cause is not initialized, and may subsequently be initialized by a call to `Throwable.initCause(java.lang.Throwable)`.

### RuntimeException

    public RuntimeException(String message)

  Constructs a new runtime exception with the specified detail message. The cause is not initialized, and may subsequently be initialized by a call to `Throwable.initCause(java.lang.Throwable)`.

Parameters:
  `message` - the detail message. The detail message is saved for later retrieval by the `Throwable.getMessage()` method.

### RuntimeException

    public RuntimeException(String message,
                            Throwable cause)

  Constructs a new runtime exception with the specified detail message and cause.

  Note that the detail message associated with `cause` is not automatically incorporated in this runtime exception's detail message.

Parameters:
  `message` - the detail message (which is saved for later retrieval by the `Throwable.getMessage()` method).
  `cause` - the cause (which is saved for later retrieval by the `Throwable.getCause()` method). (A `null` value is permitted, and indicates that the cause is nonexistent or unknown.)
Since:
  1.4

### RuntimeException

    public RuntimeException(Throwable cause)

  Constructs a new runtime exception with the specified cause and a detail message of `(cause==null ? null : cause.toString())` (which typically contains the class and detail message of `cause`). This constructor is useful for runtime exceptions that are little more than wrappers for other throwables.

Parameters:
  `cause` - the cause (which is saved for later retrieval by the `Throwable.getCause()` method). (A `null` value is permitted, and indicates that the cause is nonexistent or unknown.)
Since:
  1.4

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.