public class Traadeksempel {
    public static void main(String[] args) {
        
        Thread[] traader = new Thread[5];

        for (int i = 0; i < 5; i++) {
            traader[i] = new Thread(new Arbeider(i));
            traader[i].start();
        }

        for (int i = 0; i < 5; i++) {
            try {
                traader[i].join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println("Alle arbeidere er ferdige.");
    }
}

class Arbeider implements Runnable {

    int id;

    public Arbeider(int id) {
        this.id = id;
    }

    public void run() {
        System.out.printf("Arbeider %d sier: Hei!%n", id);
    }
}