Most applications need to process some input and produce some output based on that input.
The purpose of the Java IO package (java.io) is to make that possible in Java.
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If you look at the Java IO classes in the java.io package the vast amount
of choices can be rather confusing. What is the purpose of all these classes? Which one
should you choose for a given task? How do you create your own classes to plugin? etc.
The purpose of this tutorial is to try to give you an overview of how all these classes
are grouped, and the purpose behind them, so you don't have to wonder whether you chose
the right class, or whether a class already exists for your purpose.
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The Scope of the Java IO (java.io) Package
The java.io package doesn't actually address all types of input and output.
For instance, input from and output to a GUI or web page is not covered in the Java IO package.
Those types of input are covered elsewhere, for instance by the JFC classes in the Swing project,
or the Servlet and HTTP packages in the Java Enterprise Edition.
The Java IO package is primarily focused on input and output to files, network streams, internal memory buffers etc.
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Below is a table of contents of the topics and classes covered in this tutorial. The coverage
of the classes is not just an API listing. You can get that from Sun's official Java Doc's.
Rather each text is a short introduction to the class, its purpose, and a few examples
of how to use it. In other words, some of the stuff you don't find in Sun's official Java Doc's.
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