Реализация расписания

import java.util.ArrayList;
import java.util.List;
 
public class Main {
 
    public static void main(String[] args) {
    }
}
public abstract class Person {
    private String Name, Surname;
    private int age;
 
    public Person(String name, String surname, int age) {
        this.Name = name;
        this.Surname = surname;
        this.age = age;
    }
}
public class Student extends Person {
    private int kurs;
 
    public Student(String Name, String Surname, int age, int kurs) {
        super(Name, Surname, age);
        this.kurs = kurs;
    }
}
public class Lecturer extends Person {
    private int ID;
 
    public Lecturer(String Name, String Surname, int age, int ID) {
        super(Name, Surname, age);
        this.ID = ID;
    }
}
public class Group {
    private int GroupNum;
 
    List<Student> GroupOfStudent = new ArrayList<>();
 
    public Group(int groupNum, List<Student> groupOfStudent) {
        this.GroupNum = groupNum;
        this.GroupOfStudent = groupOfStudent;
    }
}
public class Kurs {
    List<Group> CoupleOfGroup = new ArrayList<>();
}