Create the following classes in BlueJ: A Student class that has: A field to stor

Question

Create the following classes in BlueJ:

A Student class that has:

A field to store the student’s first name.

A field to store the student’s last name.

A field to store the student’s unique student number.

Any constructors/setters/getters you feel are necessary.

A Course class that has:

A field for a unique title (for example CS101).

A field (string) that is the start time for the course (for example M15:30).

A field (string) that is the location for the course (for example ROB121).

A field that is a collection of the students registered for the course.

A field that is the capacity (maximum number of students) for the course.

Any constructors/setters/getters you feel are necessary.

A method to add a student to a course.

A method to remove a student from a course.

A method to print a list students in the course.

A method to search for a student in the course by student number.

A Registrar class that has:

A field that is a collection of all courses offered.

A constructor to initialize an empty collection of courses.

A method to add a course to the offered courses.

A method to remove a course from the offered courses.

A method to print a list of all offered courses.

A method to print a list of only the offered courses that are still available (not at capacity).

A (private) method to search the courses offered by title.

A method to register a student for a course.

A method to unregister a student from a course.

Print a list of students registered for a course.

Print a given student’s schedule.

Explanation / Answer

The required classes are written bellow. The names of methods and their functions are self explainatory.

Student Class:

package course;

public class Student {
   //All the required variable
   private String sid;
   private String fname;
   private String lname;
  
   //constructor
   public Student(String sid, String fname, String lname) {
       super();
       this.sid = sid;
       this.fname = fname;
       this.lname = lname;
   }

   @Override
   public String toString() {
       return "["+sid+" "+fname+" "+lname+"]";
   }
  
   // getter and setter methods
   public String getSid() {
       return sid;
   }

   public void setSid(String sid) {
       this.sid = sid;
   }

   public String getFname() {
       return fname;
   }

   public void setFname(String fname) {
       this.fname = fname;
   }

   public String getLname() {
       return lname;
   }

   public void setLname(String lname) {
       this.lname = lname;
   }  
}

Course Class:

package course;

import java.util.ArrayList;

public class Course {
   // all the variables
   private String title;
   private String startTime;
   private String location;
   private int capacity;
   ArrayList<Student> registeredStudents = new ArrayList<Student>();
  
   // constructor
   public Course(String title, String startTime, String location, int capacity) {
       super();
       this.title = title;
       this.startTime = startTime;
       this.location = location;
       this.capacity = capacity;
   }
  
   @Override
   public String toString() {
       return "["+title+" "+startTime+" "+location+" "+capacity+"]";
   }

   //getter and setter methods
   public String getTitle() {
       return title;
   }

   public void setTitle(String title) {
       this.title = title;
   }

   public String getStartTime() {
       return startTime;
   }

   public void setStartTime(String startTime) {
       this.startTime = startTime;
   }

   public String getLocation() {
       return location;
   }

   public void setLocation(String location) {
       this.location = location;
   }

   public int getCapacity() {
       return capacity;
   }

   public void setCapacity(int capacity) {
       this.capacity = capacity;
   }
  
   public void addStudent(String sid){
       Student s = getStudent(sid);
       if(s != null)
           registeredStudents.add(s);
   }
  
   public void addStudent(Student s){
       registeredStudents.add(s);
   }
  
   public void removeStudent(String sid){
       Student s = getStudent(sid);
       if(s != null)
           registeredStudents.remove(s);
   }
  
   public void removeStudent(Student s){
       registeredStudents.remove(s);
   }
  
   public Student getStudent(String sid){
       for(Student s: registeredStudents){
           if(s.getSid().equals(sid)){
               return s;
           }
       }
       return null;
   }
  
   public void printStudentList(){
       for(Student s: registeredStudents){
           System.out.println(s);
       }
   }
  
   public boolean isAvailable(){
       return (capacity<registeredStudents.size());
   }
  
}

Registrar Class:

package course;

import java.util.ArrayList;

public class Registrar {
  
   private ArrayList<Course> offeredCourses;

   public Registrar() {
       offeredCourses = new ArrayList<Course>();
   }
  
   public void addCourse(Course c){
       offeredCourses.add(c);
   }
  
   public void removeCourse(Course c){
       offeredCourses.remove(c);
   }
  
   // a student is allowed to register is the course is available and the start time is not conflicting
   public void registerStudent(Student s, Course c){  
       if(c.isAvailable()){
           for(Course c1 : getCourses(s)){
               if(c1.getStartTime().equals(c.getStartTime())){
                   return;
               }
           }
           c.addStudent(s);
       }
   }
  
   public void unregisterStudent(Student s, Course c){
       c.removeStudent(s);
   }
  
   public void printRegisteredStudents(Course c){
       c.printStudentList();
   }
  
   public void printStudentSchedule(Student s){
       System.out.println("Schedule for student "+s.getFname()+" "+s.getLname());
       for(Course c : offeredCourses){
           if(c.registeredStudents.contains(s)){
               System.out.println(c.getStartTime()+" "+c.getTitle());
           }
       }
   }
  
   private ArrayList<Course> getCourses(Student s){
       ArrayList<Course> cources = new ArrayList<Course>();
       for(Course c : offeredCourses){
           if(c.registeredStudents.contains(s)){
               cources.add(c);
           }
       }
       return cources;
   }
  
   public void printCourseList(){
       for(Course c: offeredCourses){
           System.out.println(c);
       }
   }
}

NB: Hope it helps to understand the classes. Please let me know if anything else is needed.

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