class Hovedprogram{

  public static void main(String[] args){

    Emne emne1 = new Emne("IN1010", "OOP: Java", false);
    Emne emne2 = new Emne("IN5010", "Masterkos", true);

    Person rektor = new Person("Rolf", 17);
    Person master = new Masterstudent("Daniel", 24, rektor);
    Bachelorstudent bach = new Bachelorstudent("Kai", 25);

    bach.registrer(emne1);

    System.out.println(rektor);
    System.out.println(master);

    Masterstudent masterstud = (Masterstudent) master;

    masterstud.registrer(emne1);

    //Student pers1 = (Masterstudent) masterstud;
    //Student pers2 = (Person) rektor;


    //ma.registrer(emne1);
    //System.out.println(ma);
  }
}