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# Class java.lang.Throwable

    java.lang.Object
       |
       +----java.lang.Throwable

public class Throwable
extends Object
implements Serializable

The `Throwable` class is the superclass of all errors and exceptions in the Java language. Only objects that are instances of this class (or of one of its subclasses) are thrown by the Java Virtual Machine or can be thrown by the Java `throw` statement. Similarly, only this class or one of its subclasses can be the argument type in a `catch` clause.

A `Throwable` class contains a snapshot of the execution stack of its thread at the time it was created. It can also contain a message string that gives more information about the error.

Here is one example of catching an exception:

>          try {
>              int a[] = new int[2];
>              a[4];
>          } catch (ArrayIndexOutOfBoundsException e) {
>              System.out.println("exception: " + e.getMessage());
>              e.printStackTrace();
>          }

##

Throwable()
  Constructs a new `Throwable` with no detail message.
Throwable(String)
  Constructs a new `Throwable` with the specified detail message.

##

fillInStackTrace()
  Fills in the execution stack trace.
getLocalizedMessage()
  Creates a localized description of this `Throwable`.
getMessage()
  Returns the detail message of this throwable object.
printStackTrace()
  Prints this `Throwable` and its backtrace to the standard error stream.
printStackTrace(PrintStream)
  Prints this `Throwable` and its backtrace to the specified print stream.
printStackTrace(PrintWriter)
  Prints this `Throwable` and its backtrace to the specified print writer.
toString()
  Returns a short description of this throwable object.

##

Throwable

      public Throwable()

  Constructs a new `Throwable` with no detail message. The stack trace is automatically filled in.

Throwable

      public Throwable(String message)

  Constructs a new `Throwable` with the specified detail message. The stack trace is automatically filled in.

  Parameters:
    message - the detail message.

##

getMessage

      public String getMessage()

  Returns the detail message of this throwable object.

  Returns:
    the detail message of this `Throwable`, or `null` if this `Throwable` does not have a detail message.

getLocalizedMessage

      public String getLocalizedMessage()

  Creates a localized description of this `Throwable`. Subclasses may override this method in order to produce a locale-specific message. For subclasses that do not override this method, the default implementation returns the same result as `getMessage()`.

toString

      public String toString()

  Returns a short description of this throwable object.

  Returns:
    a string representation of this `Throwable`.
  Overrides:
    toString in class Object

printStackTrace

      public void printStackTrace()

  Prints this `Throwable` and its backtrace to the standard error stream.

  See Also:
    err

printStackTrace

      public void printStackTrace(PrintStream s)

  Prints this `Throwable` and its backtrace to the specified print stream.

printStackTrace

      public void printStackTrace(PrintWriter s)

  Prints this `Throwable` and its backtrace to the specified print writer.

fillInStackTrace

      public Throwable fillInStackTrace()

  Fills in the execution stack trace. This method is useful when an application is re-throwing an error or exception. For example:

  >          try {
  >              a = b / c;
  >          } catch(ArithmeticThrowable e) {
  >              a = Number.MAX_VALUE;
  >              throw e.fillInStackTrace();
  >          }

  Returns:
    this `Throwable` object.
  See Also:
    printStackTrace

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