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Java Platform 1.2
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Class java.lang.Throwable

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

Direct Known Subclasses:

Error, Exception

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();
     }
 

Since:

JDK1.0

See Also:

Serialized Form

Constructor Summary

Throwable()
Constructs a new Throwable with no detail message.

Throwable(String message)
Constructs a new Throwable with the specified detail message.

Method Summary

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

Methods inherited from class java.lang.Object

clone , equals , finalize , getClass , hashCode , notify , notifyAll , wait , wait , wait

Constructor Detail

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.

Method Detail

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().

Since:

JDK1.1

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:

System.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.

Since:

JDK1.1

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()