interface Hamburger {
    String hentBeskrivelse();
    double hentPris(); 
}

class HamburgerBasis implements Hamburger {
    @Override 
    public String hentBeskrivelse() {
        return "Hamburger";
    }

    @Override 
    public double hentPris() {
        return 50.0;
    }
}


abstract class HamburgerDecorater implements Hamburger {
    private final Hamburger decoratedHamburger; 

    public HamburgerDecorater(Hamburger hamburger) {
        this.decoratedHamburger = hamburger; 
    }

    @Override 
    public String hentBeskrivelse() {
        return decoratedHamburger.hentBeskrivelse();
    }

    @Override 
    public double hentPris() {
        return decoratedHamburger.hentPris();
    }
}

class MedOst extends HamburgerDecorater {
    MedOst(Hamburger hamburger) {
        super(hamburger);
    }

    public String hentBeskrivelse() {
        return super.hentBeskrivelse() + ", med ost";
    }

    public double hentPris() {
        return super.hentPris() + 10;
    }
}

class UtenSylteagurk extends HamburgerDecorater {
    UtenSylteagurk(Hamburger hamburger) {
        super(hamburger);
    }

    public String hentBeskrivelse() {
        return super.hentBeskrivelse() + ", uten sylteagurk";
    }

    public double hentPris() {
        return super.hentPris() - 5;
    }
}

 class Hamburgerbar {
    public static void main(String[] args) {
        Hamburger burger = new HamburgerBasis();
        burger = new MedOst(burger);
        burger = new UtenSylteagurk(burger);

        System.out.println(burger.hentBeskrivelse() + ", " + burger.hentPris());
    }
 }