Graded Students Lab

• Purpose - to demonstrate the use of Java classes and data encapsulation.
• Objective - to create a Classroom which manipulates a composite List of Student objects which contain data detailing their firstName, lastName, and examScores.
• Restrictions - Ensure positive and negative unit tests exist per feature of the application

Part 1; Create class Student

• Create a class Student.

Part 1.1; Defining instance variables

• Declare an instance variable for each of the previously mentioned properties:
  • String firstName
    • a collection of characters representative of a first name.
  • String lastName
    • a collection of characters representative of a last name.
  • ArrayList<Double> examScores
    • a dynamic collection of decimal values representative of test scores.

Part 1.2; Defining construction

• Define a Student constructor whose parameters are used to initalize its instance variables.
• The Student constructor has expected parameters of
  • String representative of a firstName
  • String representative of a lastName
  • Double[] representative of a collection of testScores

Part 1.3; Defining methods

• Getters and Setters
  • Define a getter and setter for each of the instance variables declared in the Student class.
    • Note: There should not be a setter for the testScore. This object's state will be mutated via a takeExam method mentioned below.
    • Additionally, define a getter, getNumberOfExamsTaken(), which returns the total number of exams taken by this student.

• Define method getExamScores()

  • Student should define a method which returns a string representation of all exams taken.

    • Sample Script:

       // : Given
       String firstName = "Leon";
       String lastName = "Hunter";
       Double[] examScores = { 100.0, 95.0, 123.0, 96.0 };
       Student student = new Student(firstName, lastName, examScores);
       
       // When
       String output = student.getExamScores();
       
       // Then
       System.out.println(output);
      

    • Sample Output

       Exam Scores:
       	Exam 1 -> 100
       	Exam 2 -> 95
       	Exam 3 -> 123
       	Exam 4 -> 96
      

• Define method addExamScore(double examScore)

  • Student should define a method named addExamScore which uses a double parameter to add an examScore to its composite List examScores.

    • Sample Script:

       // : Given
       String firstName = "Leon";
       String lastName = "Hunter";
       Double[] examScores = { };
       Student student = new Student(firstName, lastName, examScores);
       
       // When
       student.addExamScore(100.0);
       String output = student.getExamScores();
       
       // Then
       System.out.println(output);
      

    • Sample Output

       Exam Scores:
       	Exam 1 -> 100
      

• Define method setExamScore(int examNumber, double newScore)

  • Student should define a method named setExamScore which uses an int parameter to identify an exam in the list, and a double parameter to re-assign the respective value.

    • Sample Script:

       // : Given
       String firstName = "Leon";
       String lastName = "Hunter";
       Double[] examScores = { 100.0 };
       Student student = new Student(firstName, lastName, examScores);
       
       // When
       student.setExamScore(1, 150.0);
       String output = student.getExamScores();
       
       // Then
       System.out.println(output);
      

    • Sample Output

       Exam Scores:
       	Exam 1 -> 150
      

• Define method getAverageExamScore()

  • Student should define a method named getAverageExamScore() which returns the sum of the examScore list divided by its size.

    • Sample Script:

       // : Given
       String firstName = "Leon";
       String lastName = "Hunter";
       Double[] examScores = { 100.0, 150.0, 250.0, 0.0 };
       Student student = new Student(firstName, lastName, examScores);
       
       // When
       Double output = student.getAverageExamScore();
       
       // Then
       System.out.println(output);
      

    • Sample Output

       125.0
      

• Define method toString()

  • Student should override the toString method by returning a clean String representation of the person.

    • Sample Script:

       // : Given
       String firstName = "Leon";
       String lastName = "Hunter";
       Double[] examScores = { 100.0, 150.0, 250.0, 0.0 };
       Student student = new Student(firstName, lastName, examScores);
       
       // When
       String output = student.toString();
       
       // Then
       System.out.println(output);
      

    • Sample Output

       Student Name: Leon Hunter
       > Average Score: 125
       > Exam Scores:
           Exam 1 -> 100
           Exam 2 -> 150
           Exam 3 -> 250
           Exam 4 -> 0
      

Part 2; Create class Classroom

• Create a class Classroom

Part 2.1; Defining instance variables

• Declare an instance variable for each of the Classroom properties:
  • Student[] students
    • a collection of student objects

Part 2.2; Defining construction

• Define a Classroom constructor whose parameters are used to initalize its instance variable. The class Classroom should support 3 different ways of being constructed.

  1. The class Classroom should define a constructor which takes an argument of an int representative of the maxNumberOfStudents that this Classroom can hold.

  2. The class Classroom should define an additional constructor which takes an argument of Student[] representative of the collection of Student objects this Classroom will store.

  3. The class Classroom should define a nullary constructor which initializes the composite students object to be an empty array of 30 Student objects.

Part 2.3; Defining methods

• Define method getStudents()
  • Define a getter which returns the composite students object.

• Define method getAverageExamScore()

  • Define a getter which returns the sum of all exam averages divided by the number of students.

    • Sample Script:

       // : Given
       Double[] s1Scores = { 100.0, 150.0 };
       Double[] s2Scores = { 225.0, 25.0 };
       
       Student s1 = new Student("student", "one", s1Scores);
       Student s2 = new Student("student", "two", s2Scores);
       
       Student[] students = {s1,s2};
       Classroom classroom = new Classroom(students);
       
       // When
       double output = classroom.getAverageExamScore();
       
       // Then
       System.out.println(output);
      

    • Sample Output

       125.0
      

• Define method addStudent(Student student)

  • Define a method which uses a Student parameter to add a Student object to the composite students list.

    • Sample Script:

       // : Given
       int maxNumberOfStudents = 1;
       Classroom classroom = new Classroom(maxNumberOfStudents);
       Double[] examScores = { 100.0, 150.0, 250.0, 0.0 };
       Student student = new Student("Leon", "Hunter", examScores);			
      
       // When
       Student[] preEnrollment = classroom.getStudents();
       classroom.addStudent(student);
       Student[] postEnrollment = classroom.getStudents();
       
       // Then
       String preEnrollmentAsString = Arrays.toString(preEnrollment);
       String postEnrollmentAsString = Arrays.toString(postEnrollment);
      
       System.out.println("===========================");
       System.out.println(preEnrollmentAsString);
       System.out.println("===========================");
       System.out.println(postEnrollmentAsString);
      

    • Sample Output

       ===========================
       []
       ===========================
       [Student Name: Leon Hunter
       > Average Score: 125
       > Exam Scores:
           Exam 1 -> 100
           Exam 2 -> 150
           Exam 3 -> 250
           Exam 4 -> 0]
      

• Define method removeStudent(String firstName, String lastName)
  • The class Classroom should define a method which uses a firstName and lastName parameter to identify and remove the respective student from composite students object.
  • Ensure the array is re-ordered after the removal; Null values should be located in the final indices of the array.

• Define method getStudentsByScore()
  • The class Classroom should define a method getStudentsByScore() which returns an array representation of Student objects sorted in descending order by score.
  • If two students have the same class average, order them lexigraphically.

• Define method getGradeBook()
  • The class Classroom should define a method getGradeBook() which returns a mapping of Student objects to a respective letter grade determined by creating a grading curve such that
    • An A is awarded to students whose class average is in the upper 10th percentile.
    • A B is awarded to students whose class average falls between the upper 11th and 29th percentile.
    • A C is awarded to students whose class average falls between the upper 30th and 50th percentile.
    • A D is awarded to students whose class average falls between the lower 51st and 89th percentile.
    • An F is awarded to students whose class average is in the lower 11th percentile.