Question

A Student (you need to declare a class for it) is a class defining a Student with information (such as name, id , average, letter grade and a list of 6 test scores) and associated operations (Constructors, mutators, accessors, auxiliary operation anything else you like).

Answer 1

1. public class Student {
3. private String name;
4. private String id;
5. private double averageScore;
6. private double [] testScores = new double[6];
7. private String [] letterGrade = new String[6];
9. public Student(String name, String id, double [] testScores)
10. {
11. this.name = name;
12. this.id = id;
14. setTestScores(testScores);
15. setLetterGrade();
16. setAverageScore();
17. }
19. public String getName()
20. {
21. return this.name;
22. }
24. public String getId()
25. {
26. return this.id;
27. }
29. public void setTestScores(double [] testScores)
30. {
31. for(int i=0; i < testScores.length; i++)
32. {
33. if(testScores[i] >=0 && testScores[i] <=100) {
34. this.testScores[i] = testScores[i];
35. }
36. else{
37. throw new IllegalArgumentException("The score must be within 0-100");
38. }
39. }
40. }
42. public double [] getTestScores()
43. {
44. return this.testScores;
45. }
47. public void setLetterGrade()
48. {
49. for(int i = 0; i < this.letterGrade.length; i++)
50. {
51. this.letterGrade[i] = convert_to_grade(this.testScores[i]);
52. }
53. }
55. public String [] getLetterGrade()
56. {
57. return this.letterGrade;
58. }
60. public void setAverageScore()
61. {
62. double total = 0;
64. for(int i = 0; i < this.testScores.length; i++)
65. {
66. total += this.testScores[i];
67. }
69. this.averageScore = total / 6;
70. }
72. public double getAverageScore()
73. {
74. return this.averageScore;
75. }
77. private String convert_to_grade(double score)
78. {
79. if(score >= 80) {
80. return "A";
81. }
82. else if(score >=70) {
83. return "B";
84. }
85. else if(score >= 60) {
86. return "C";
87. }
88. else if(score >=50) {
89. return "D";
90. }
91. else {
92. return "F";
93. }
94. }
96. public void displayStudentInfo()
97. {
98. System.out.println("Name : " + this.name);
99. System.out.println("ID : " + this.id);
100. System.out.println("Average score: " + this.averageScore);
101. }
102. }

Step-by-step explanation:

Line 1:

• Create a class and name it as Student

Line 3 - 4:

• Define class properties to hold the information related to student such as name, id, test scores, letter grade and average score.

Line 9 - 17:

• Create Constructor.

• This Constructor will accept three arguments, name, id and testScores.
• The Constructor is used to initialize all the class properties

Line 19 - 22; Line 24 - 27; Line 42 - 45; Line 55 - 58; Line 72-75:

Create Accessors for

• name property (Line 19 - 22)
• id property (Line 24 - 27)
• testScores property (Line 42 - 45)
• letterGrade property (Line 55-58)
• averageScore property (Line 72-75)

Line 29 - 40; Line 47 - 53; Line 60 - 70:

Create Mutators for

• testScores property (Line 29 - 40)
• letterGrade property (Line 47 - 53)
• averageScore property (Line 60 -67)

Line 77 - 94 and Line 96 - 101:

Create auxiliary methods for

• converting score to a corresponding grade (Line 77 - 94)
• displaying student summary (Line 96 - 101)