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Your post#4 sounds like a Queueing Theory problem. I worked on lots of those at school.

Can you give an example of when you would use an exception?

Is this the same problem you posted on this other thread?
http://www.javaprogrammingforums.com/whats-wrong-my-code/9986-help-error-parsing-file.html#post37598

Try compiling it with javac.
You'll...