1  import java.util.Scanner;

  2  

  3  /**

  4     This program demonstrates the use of mock objects

  5     for testing.

  6  */

  7  public class GradingProgram

  8  {

  9     public static void main(String[] args)

 10     {

 11        IGradeBook gradeBook = new MockGradeBook();

 12        Scanner in = new Scanner(System.in);

 13        boolean done = false;

 14        while (!done) 

 15        {

 16           System.out.print("L)oad A)dd aV)erage S)ave Q)uit: ");

 17           String command = in.next().toUpperCase();

 18           if (command.equals("L")) 

 19           {

 20              System.out.print("Filename: ");

 21              String filename = in.next();

 22              gradeBook.load(filename);

 23           }

 24           else if (command.equals("S")) 

 25           {

 26              System.out.print("Filename: ");

 27              String filename = in.next();

 28              gradeBook.save(filename);

 29           }

 30           else if (command.equals("A")) 

 31           {

 32              System.out.print("ID: ");

 33              int id = in.nextInt();

 34              System.out.print("Score: ");

 35              double score = in.nextDouble();

 36              gradeBook.addScore(id, score);

 37           }

 38           else if (command.equals("V")) 

 39           {

 40              System.out.print("ID: ");

 41              int id = in.nextInt();

 42              System.out.println("Average for " + id + ": " 

 43                 + gradeBook.getAverageScore(id));

 44           }

 45           else if (command.equals("Q")) 

 46           {

 47              done = true;

 48           }         

 49        }

 50     }

 51  }