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when an exception occurs that a method is unable to handle – does the program terminate and show the error number ? where does the error number and information about the error come from ? should the programmer while coding have an idea what kind of exception might occur. if so why does’nt he ensure that exception does not occur .
If you are using Java APIs, the exceptions that each method throws are documented.
When the program terminate, it shows an stacktrace of the methods calls that caused that specific problem.
Check the lesson on Exceptions from The Java Tutorial. You can learn much more reading there than reading my answer here 🙂