Arrays - Java - page 394

Display 6.18 A Grade Book Class (part 2 of 4)

16 numberOfStudents = a.length;

17 numberOfQuizzes = a[0].length;

18 fillGrade(a);

19 fillStudentAverage();

20 fillQuizAverage();

21 }

22 public GradeBook(GradeBook book)

23 {

24 numberOfStudents = book.numberOfStudents;

25 numberOfQuizzes = book.numberOfQuizzes;

26 fillGrade(book.grade);

27 fillStudentAverage();

28 fillQuizAverage();

29 }

30 public GradeBook()

31 {

32 Scanner keyboard = new Scanner(System.in);

33 System.out.println("Enter number of students:");

34 numberOfStudents = keyboard.nextInt();

35 System.out.println("Enter number of quizzes:");

36 numberOfQuizzes = keyboard.nextInt();

37 grade = new int [numberOfStudents][numberOfQuizzes];

38 for ( int studentNumber = 1;

39 studentNumber <= numberOfStudents; studentNumber++)

40 for ( int quizNumber = 1;

41 quizNumber <= numberOfQuizzes; quizNumber++)

42 {

43 System.out.println("Enter score for student number "

44 + studentNumber);

45 System.out.println("on quiz number " + quizNumber);

46 grade[studentNumber − 1][quizNumber − 1] =

47 keyboard.nextInt();

48 }

This class should have more accessor and
mutator methods, but we have omitted them
to save space. See Self-Test Exercises 24
through 27.

49 fillStudentAverage();

50 fillQuizAverage();

51 }

52 private void fillGrade( int [][] a)

53 {

54 grade = new int [numberOfStudents][numberOfQuizzes];