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  Tutorial: Console I/O

Java was designed for graphical user interfaces (GUI) and industrial strength file and Internet I/O.

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Java was designed for graphical user interfaces (GUI) and industrial strength file and Internet I/O. No attempt was made to have simple input and output facilities like C++'s cin and cout. This isn't a problem for big programs, but it makes small student examples large and awkward, requiring knowledge of conversion and exceptions from the beginning. In practice console input is rarely used, but programmers often use System.out.println for output during the debugging phase.
Console I/O streams
There are three predefined I/O streams that use the console. These are equivalent to Unix standard input, error, and output streams.


 

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