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Scanner has been used with the standard input stream:

Scanner scan = new Scanner( System.in );

By using input redirection, the standard input stream has sometimes come from a disk file.

I/O Streams

input characters converted to internal numbers

Recall, from chapter 10, that input and output are done with streams of data. There is a standard input stream, a standard output stream, and a standard error stream.

A Scanner object constructed with System.in scans the standard input stream for groups of characters. Some of its methods convert a group characters to a specific data type. For example, the nextInt() method reads in a group of characters that can be converted to an int.


Could the characters of an input stream come from a disk file?