public class Barrier {
    public static void main(String[] args) {
        Thread[] threads = new Thread[10];
        for(int i = 0; i < threads.length; i++) {
            threads[i] = new Thread(new Worker()); 
            threads[i].start();
        }

        for(Thread t: threads) {
            try {
                t.join();
            } catch(InterruptedException e) {
                System.exit(1);
            }
        }

        System.out.println("Systemet avslutter");
    }
}

class Worker implements Runnable {
    public void run() {
        System.out.println("hei");
    }
}