1  import java.io.File;

  2  import java.io.FileNotFoundException;

  3  import java.io.PrintWriter;

  4  import java.util.Scanner;

  5  

  6  /**

  7     This program applies line numbers to a file.

  8  */

  9  public class LineNumberer

 10  {

 11     public static void main(String[] args) throws FileNotFoundException

 12     {

 13        // Prompt for the input and output file names

 14  

 15        Scanner console = new Scanner(System.in);

 16        System.out.print("Input file: ");

 17        String inputFileName = console.next();

 18        System.out.print("Output file: ");

 19        String outputFileName = console.next();

 20  

 21        // Construct the Scanner and PrintWriter objects for reading and writing

 22  

 23        File inputFile = new File(inputFileName);

 24        Scanner in = new Scanner(inputFile);

 25        PrintWriter out = new PrintWriter(outputFileName);

 26        int lineNumber = 1;

 27        

 28        // Read the input and write the output

 29  

 30        while (in.hasNextLine())

 31        {

 32           String line = in.nextLine();

 33           out.println("/* " + lineNumber + " */ " + line);

 34           lineNumber++;

 35        }

 36  

 37        in.close();

 38        out.close();

 39     }

 40  }