Question

Short Answer Questions Q4. [10 marks] The following UML class diagram describes the structure of a Java program for managing university courses. Implement just the Course class by writing a Java class that implements it. You can assume that the Student and Staff classes have already been coded in Java and that they have getter methods for each data field. [see next page for more details] Course Student -id : int -code: String name: String +Student() +Course(code:String) enrolled enrolStudent(s:Student) +sitExamint +withdrawStudent(s: Student): boolean lecturer Staff name: String +Staff +markExams0

[Continued] Your Course class should have:

1)a getter for the course 'code', so that it is read-only;

2)a getter and setter for the lecturer attribute, so that it is readable and writable;

3)a constructor that creates the associations shown in the UML diagram;

4)an enrolStudent method that adds a given Student object into the 'enrolled' set;

5)a withdrawStudent method that removes a given Student object from the 'enrolled' set and returns true if the student was successfully found and removed, false otherwise.

Answer 1

// 1)a getter for the course 'code', so that it is read-only;

public String getCode() {

return code;

}

// 2)a getter for the lecturer attribute, so that it is readable

public Staff getLecturer() {

return lecturer;

}

// 2)a setter for the lecturer attribute, so that it is writable;

public void setLecturer(Staff lecturer) {

this.lecturer = lecturer;

}

// 4)an enrolStudent method that adds a given Student object into the

// 'enrolled' set;

public void enrolStudent(Student s) {

// simply adding

enrolled.add(s);

}

// 5)a withdrawStudent method that removes a given Student object from the

// 'enrolled' set and returns true if the student was successfully found and

// removed, false otherwise.

public boolean withdrawStudent(Student s) {

// finding the student

for (int i = 0; i < enrolled.size(); i++) {

if (enrolled.get(i).getId() == s.getId()) {

// found, removing and returning true

enrolled.remove(i);

return true;

}

}

return false; // not found

}

}