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）
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