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site theme web site theme web You may or may not print an error message. 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.

site theme web However don't put an error message in exception handlers you expect to be exercised in the course of normal program flow. 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.

site theme web File I/O and StreamsSometimes you write data to a file instead of the computer screen. Under Unix and DOS you can sometimes do this using the redirection operators < and >. However sometimes you need a more fine-grained approach that writes only certain data to a file while still putting other data on the screen. Or you may need access to multiple files simultaneously. Or maybe you want to query the user for input rather than accepting it all on the command line.

site theme web Or maybe you want to read data out of a file that's in a particular format. In Java all these methods take place as streams.Streams are a big topic in Java and later we'll devote an entire chapter to them. For now we want to cover just the very basics that let you write files, read files and communicate with the user. In fact the System.

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