Chapter 6.2, Problem 5SCP

Program Plan Intro

Reading the data from the files using “Scanner” class:

• The user can read data from a file using the object of “Scanner” class.
• The Scanner object is like a faucet, that the user can attach a pipe that has water flowing through it. The source of the water is different.
• Normally, the object of “Scanner” constructor is created by passing “System.in” to the Scanner constructor.
• To create Scanner object for file operation, instead of passing “System.in” to the constructor, user should pass File object.

  File f = new File( "hamlet . txt" );

  Scanner input = new Scanner(f) ;

• In the above snippet of code, the file object f is created. This file object is passed to the “Scanner” constructor to get the data from the file using the object “input”.
• When the Scanner object is created, it points to the starting or beginning of the file.
• The Scanner class cut the line at the blank space and each portion of the line is called as a token.