import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class Telleprogram {
    public static void main(String[] args) {

        TelleMonitor monitor = new TelleMonitor();
        TelleTask telle = new TelleTask(monitor);

        for (int i = 0; i < 5; i++) {
            new Thread(telle).start();
        }


        System.out.println("Telling er ferdig!");

    }
}

class TelleMonitor {

    private int deltTeller = 0;
    Lock laas = new ReentrantLock();

    void oek() {
        laas.lock();
        try {
            deltTeller++;
        } finally {
            laas.unlock();
        }
    }

    int hentTeller() {
        return deltTeller;
    }

}


class TelleTask implements Runnable {
    private final int MAX_COUNT = 10000;
    private TelleMonitor monitor;

    TelleTask(TelleMonitor m) {
        this.monitor = m;
    }

    public void run() {
        for (int i = 0; i < MAX_COUNT; i++) {
            monitor.oek();
        }
        System.out.println("Ferdig! delt teller: " + monitor.hentTeller());
    }

}