explain me about programming in exception handling and threading and synchronization

maybe if you were to ask nicely instead of trying to command us to do something you'd get some response.
Most likely it would be a link to a tutorial or online bookstore where you could read up on the topics, which are explained quite well in both online and printed literature.

I don't think that explanation of such topics on a thread is not easy. As jwenting says, better to refer a book or whatever and question after you comes with. On the web you can find a lot. One of my recommend is the Sun official web site, as most of the people suggested.

google "java exceptions" may help you better... :D... i believe the problem is solved.... ;)

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