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web site web site Sometimes catching an exception can feel like a little yippy dog that finally catches a car. Now that it's got hold of the bumper between its teeth, what is it going to do with it? Many times there may not be much you can do. Bad exceptions stop the program by default. This is at least preferable to unhandled exceptions in most programming languages where the entire system can come crashing down around your feet with a core dump or worse. Sometimes you may want to this too.

web site In that case you can call the System.exit(int) method to halt your running program. Other times you may just break out of a loop you were in and continue with the rest of your code. This is most common when an exception isn't really unexpected or when it doesn't badly affect your program logic. You may or may not print an error message.

web site If you write an exception handler and you don't expect it to be called, then by all means put a System.out.println("Error: " + e);in your exception handler. That way if something does go wrong (and something always does) you'll at least know where it went wrong. However don't put an error message in exception handlers you expect to be exercised in the course of normal program flow.

web site Remember, they're exceptions, not errors.In the next section we'll see lots of examples of code that can possibly generate exceptions which must be caught. We'll talk more about exceptions in a later chapter, but this is the bare bones you need to know to respond to the exceptions generated by the java.io classes we'll be discussing in the next section.File I/O and StreamsSometimes you write data to a file instead of the computer screen.

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