import java.util.concurrent.CountDownLatch;

class EksempelCountDown{

    private static final int ANTALL_TRAADER = 5;

    public static void main(String[] args) {
        CountDownLatch cdl = new CountDownLatch(ANTALL_TRAADER);
        for(int i = 0; i < ANTALL_TRAADER; i++){
            new Thread(new CountDownTraad(cdl)).start();
        }

        System.out.println("Hovedtraad venter");
        try {
            cdl.await();
        } catch (Exception e) {
            System.out.println("Ble forstyrret");
        }
        System.out.println("Hovedtraad ferdig");

    }
}

class CountDownTraad implements Runnable{

    private CountDownLatch cdl;

    public CountDownTraad(CountDownLatch cdl){
        this.cdl = cdl;
    }

    @Override
    public void run(){
        System.out.println("CountDown");
        cdl.countDown();
    }
}