參考資料：
GradeBook, GradeBookTest 兩個 class 分別存放在 GradeBook.java, GradeBookTest.java 檔
案中，且位於同一個目錄，下列部分題目必須參考這些程式碼。
1 //GradeBook.java 

2 public class GradeBook 

3 { 

4 private String courseName; 

5 private int[] grades; 

6
7 public GradeBook( String name, int[] gradesArray ) 

8 { 

9 courseName = name;

10 grades = gradesArray; 

11 } 

12 public void setCourseName( String name ) 

13 { 

14 courseName = name;
15 } 

16 public String getCourseName() 

17 { 

18 return courseName;
19 } 

20 public void displayMessage() 

21 { 

22 System.out.printf( "Welcome to the grade book for
%s!

", 23 getCourseName() ); 

24 } 

25 public void processGrades() 

26 { 

27 outputGrades(); 

28 System.out.printf( "
Class average is %.2f
", getAverage() ); 

29 //outputBarChart(); 

30 } 

31 public double getAverage() 

32 { 

33 int total = 0; // initialize total
34 for ( int grade : grades ) 

35 total += grade; 

36 return ( double ) total / grades.length; 

37 } 

38
39 //public void outputBarChart() 

40
41 public void outputGrades() 

42 { 

43 System.out.println( "The grades are:
" ); 

44 for ( int student = 0; student ＜ grades.length; student++ ) 

45 System.out.printf( "Student %2d: %3d
", 

46 student + 1, grades[ student ] ); 

47 } 

48 } 

1 // GradeBookTest.java 

2 public class GradeBookTest 

3 { 

4 public static void main( String[] args ) 

5 { 

6
7 int[] gradesArray = { 87, 68, 94, 100, 83, 78, 85, 91, 76, 87 }; 

8
9 GradeBook myGradeBook = new GradeBook( 

10 "CS101 Introduction to Java Programming", gradesArray ); 

11 myGradeBook.displayMessage(); 

12 myGradeBook.processGrades(); 

13 } 

14 }

一、參考 GradeBook.java, GradeBookTest.java 檔案，試問 GradeBook 的建構子（Constructor）
在那裡？作用為何？（10 分）

詳解 (共 1 筆)