Are there any recommended tutorials on custom Exceptions?

I am interested in writing my own custom Exceptions for my code, but I don't know where to begin. There doesn't seem to be such a tutorial on the Sun site, so recommendations on where to go would be very helpful. Thanks.

These are my favourite
http://www.ctrlpaint.com/
Digital Tutors has some good stuff
http://www.digitaltutors.com/11/index.php?gclid=CNaF38q14MMCFQpwvAodMJwAbg
But you need to register an account for both of them.  Lots of titles out there if you look though.
The Bert Monroy titles on Lynda.com are also very good, but a slightly different style.  More illustration that digital painting.  Take a look at his huge Times Square graphic to see what he does.  Zoom way way in to see the incredibly detail
Times Square
Loads of of tips and tricks in Steve Caplin's 'How to Cheat in Photoshop', and even better '100% Photoshop'.
Good luck and have fun.  By far the most enjoyable way to use Photoshop in my opinion.

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