ExceptionListener Interface

Chapter 12 - Exception Callback Java Thread Programming Paul Hyde

size=1>  size=2>Copyright � 1999 Sams Publishing

size=4>ExceptionListener Interface

size=2>Classes that want to be notified when an exception occurs in an active class can implement the face="Courier New" size=2>ExceptionListener color=#010100 face=Arial size=2> interface shown in Listing 12.1.

size=2>Listing 12.1  ExceptionListener.java—The Interface to Be Implemented for Exception Callback

face="Courier New" size=2>1: public interface ExceptionListener {

face="Courier New" size=2>2:     public void exceptionOccurred(Exception x, Object source);

face="Courier New" size=2>3: }

size=2>This interface declares that classes of the type color=#010100 face="Courier New" size=2>ExceptionListener size=2> must implement an face="Courier New" size=2>exceptionOccurred() color=#010100 face=Arial size=2> method. An active class will invoke this method on the listener whenever a notable exception should be relayed. The first parameter, face="Courier New" size=2>x size=2>, is a reference to the actual exception. The second parameter, size=2>source, is a reference to the active class that caught the exception. Having a reference to the size=2>source object allows one size=2>ExceptionListener size=2> to monitor more than one active object and take a different course of action for each object monitored. If this is not necessary, the size=2>source parameter can simply be ignored.

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