Question

I need help with my java homework. The code will be below.

Enter from console the student code, and we get all the information about the student. Enter the code of the course and we get all the information about course. Write and read the information of the enrollments in file using serialized class Enrollment. Add a method in Controller that displays for each course the respective number of the students.

package com.example;

import java.io.Serializable;
import java.util.Date;

public class Enrollment implements Serializable {
   private Student student;
   private Course course;
   private Date registration;
   public Enrollment(Student student, Course course, Date registration) {
       super();
       this.student = student;
       this.course = course;
       this.registration = registration;
   }
   public Student getStudent() {
       return student;
   }
   public Course getCourse() {
       return course;
   }
   public Date getRegistration() {
       return registration;
   }
   public String toString() {
       return "[enrollment "+student.getCode()+" "+
   course.getCode()+" "+registration+"]";
   }

}

Answer 1

package HomeworkLib.sorting;

public class Student {
  
   private String student_name;
   private int student_id;
  
   public Student(String student_name , int student_id){
       this.student_name = student_name;
       this.student_id = student_id;
   }
  
   public synchronized String getStudent_name() {
       return student_name;
   }
   public synchronized void setStudent_name(String student_name) {
       this.student_name = student_name;
   }
   public synchronized int getStudent_id() {
       return student_id;
   }
   public synchronized void setStudent_id(int student_id) {
       this.student_id = student_id;
   }
  

}

package HomeworkLib.sorting;

public class Course {

   public String Course_name;
   public int Course_id;
   public int no_of_students;
  
   public Course(String Course_name, int Course_id , int no_of_students)
   {
       this.Course_name = Course_name;
       this.Course_id = Course_id;
       this.no_of_students = no_of_students;
   }

   public synchronized String getCourse_name() {
       return Course_name;
   }

   public synchronized void setCourse_name(String course_name) {
       Course_name = course_name;
   }

   public synchronized int getCourse_id() {
       return Course_id;
   }

   public synchronized void setCourse_id(int course_id) {
       Course_id = course_id;
   }

   public synchronized int getNo_of_students() {
       return no_of_students;
   }

   public synchronized void setNo_of_students(int no_of_students) {
       this.no_of_students = no_of_students;
   }
}

package HomeworkLib.sorting;

import java.io.Serializable;
import java.util.Date;

public class Enrollment implements Serializable {

   private Student student;
   private Course course;
   private Date registration;
  
   public Enrollment(Student s1,Course c1, Date registration)
   {
       this.student = s1;
       this.course = c1;
       this.registration = registration;
   }

   public synchronized Student getStudent() {
       return student;
   }

   public synchronized void setStudent(Student student) {
       this.student = student;
   }

   public synchronized Course getCourse() {
       return course;
   }

   public synchronized void setCourse(Course course) {
       this.course = course;
   }

   public synchronized Date getRegistration() {
       return registration;
   }

   public synchronized void setRegistration(Date registration) {
       this.registration = registration;
   }
  
}

package HomeworkLib.sorting;

import java.util.Date;
import java.util.Scanner;

public class Mainclass {
  
   public static void main(String[] args) {
      
       Scanner scan = new Scanner(System.in);
      
      
       Student s1[] = new Student[10];
       Course c1[] = new Course[10];
       Enrollment e1[] = new Enrollment[10];
      
      
       s1[0] = new Student("Test1", 123);
       c1[0] = new Course("JAva", 1234,10);
       e1[0] = new Enrollment(s1[0], c1[0], new Date());
       s1[1] = new Student("Test12", 1234);
       c1[1] = new Course("C++", 12,15);
       e1[1] = new Enrollment(s1[1], c1[1], new Date());
      
       System.out.println("Enter Student code");
       int a = scan.nextInt();
       for (int i = 0; i < e1.length; i++) {
           if(e1[i].getStudent().getStudent_id() == a)
           {
               System.out.println(e1[i].getStudent().getStudent_name());
               break;
           }
       }
      
       System.out.println("Enter Course code");
       int code = scan.nextInt();
       for (int i = 0; i < e1.length; i++) {
           if(e1[i].getCourse().getCourse_id() == code)
           {
               System.out.println(e1[i].getCourse().getCourse_name());
               System.out.println(e1[i].getCourse().getNo_of_students());
               break;
           }
       }
      
      
      
   }

}