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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.

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