go to previous page   go to home page   go to next page


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.

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 read in a group of characters that can be converted to an int.


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