Chapter 4, Problem 18AW

Program Plan Intro

Scanner and File class:

The Scanner class helps to create the object for Scanner method for reading the input strings from console and inputs are delimited by whitespace characters.

The syntax to create an object for Scanner class using System.in is given below:

Scanner objName = new Scanner(System.in);

Instead of reading input using “System.in”, the “Scanner” class can read input from the file using “File” class object. The user should pass “File” class object in the “Scanner” class constructor to open a file for reading.

File myFile =new File("Sales.txt");

Scanner inputFile = new Scanner(myFile);

Here,

• “myFile” is the “File” class object
• “Sales.txt” is the file to be opened for reading
• “inputFile” is the “Scanner” class object.
• “myFile” is passed as an argument in the “Scanner” class constructor.