import java.io.InterruptedIOException;
import java.util.concurrent.CountDownLatch;

class EksCountDown {
    public static void main(String[] args) {
        CountDownLatch cdl = new CountDownLatch(5);
        for (int i = 0; i < 5; i++) {
            new Thread(new TraadCountDown(i, cdl)).start();
        }
        System.out.println("Main-trad venter");
        try {
            cdl.await();
        }
        catch (InterruptedException e) {
            System.out.println("Ble avbrutt");
        }
        System.out.println("Main-trad ferdig");
    }
}

class TraadCountDown implements Runnable {
    private CountDownLatch cdl;
    private int id;

    public TraadCountDown(int id, CountDownLatch cdl) {
        this.id = id;
        this.cdl = cdl;
    }

    @Override
    public void run() {
        System.out.println("Trad " + id + ": CountDown");
        cdl.countDown();
        System.out.println(cdl.getCount());
    }
}