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Thinking in Java
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Standard I/O

The term standard I/O refers to the Unix concept (which is reproduced in some form in Windows and many other operating systems) of a single stream of information that is used by a program. All the program’s input can come from standard input, all its output can go to standard output, and all of its error messages can be sent to standard error. The value of standard I/O is that programs can easily be chained together, and one program’s standard output can become the standard input for another program. This is a powerful tool.
Thinking in Java
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire