Catching Exceptions

You now know how to throw an exception. It is pretty easy. You throw it and you forget it. Of course, some code has to catch the exception. Catching exceptions requires more planning.

If an exception occurs that is not caught anywhere, the program will terminate and print a message to the console, giving the type of the exception and a stack trace. Graphics programs (both applets and applications) catch exceptions, print stack trace messages, and then go back to the user interface processing loop. (When you are debugging a graphically based program, it is a good idea to keep the console available on the screen and not minimized.)