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 reads a file with numbers, and writes the numbers to another

  8     file, lined up in a column and followed by their total. 

  9  */

 10  public class Total

 11  {

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

 13     {

 14        // Prompt for the input and output file names

 15  

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

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

 18        String inputFileName = console.next();

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

 20        String outputFileName = console.next();

 21  

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

 23  

 24        File inputFile = new File(inputFileName);

 25        Scanner in = new Scanner(inputFile);

 26        PrintWriter out = new PrintWriter(outputFileName);

 27  

 28        // Read the input and write the output

 29  

 30        double total = 0;

 31        

 32        while (in.hasNextDouble())

 33        {

 34           double value = in.nextDouble();

 35           out.printf("%15.2f\n", value);

 36           total = total + value;

 37        }

 38  

 39        out.printf("Total: %8.2f\n", total);

 40  

 41        in.close();

 42        out.close();

 43     }

 44  }