public class Main {
    public static void main(String[] args) {
        Romskip romskip = new Romskip();

        Runnable leveringsskip = new Leveringsskip(romskip);
        Runnable astronaut = new Astronaut(romskip);

        Thread t1 = new Thread(leveringsskip);
        Thread t2 = new Thread(astronaut);

        t1.start();
        t2.start();
    }
}