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Answer:

Scanner has been used with the standard input stream:

Scanner scan = new Scanner( System.in );

I/O Streams

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 stardard error stream.

input characters convered to internal numbers

When a Scanner object is constructed with System.in , it scans the standard input stream of characters for patterns that the program asks for and (sometimes) converts those characters to a specific data type. For example, the nextInt() method is used to match characters that can be converted to an int.

QUESTION 2:

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