Input Stream from a File

With file input redirection, a disk file is connected to the standard input stream used by a Scanner object. You can also construct a scanner object that connects to a disk file:

File    file = new File("myData.txt");   // create a File object
Scanner scan = new Scanner( file );      // connect a Scanner to the file

These statements first create a File object. This is a software object that represents a disk file. Next a Scanner object is constructed and connected to the actual file.

The same methods can be used with this Scanner object as with standard input. Characters than can be converted into an int can be scanned in using nextInt() as with the standard input stream.