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

// Monitor siden den beskytter en felles ressurs med laas
class TellerMonitor {
    private Lock laas = new ReentrantLock();
    private int sharedCounter = 0;

    public void oekTeller() {
        laas.lock();
        try {
            sharedCounter += 1;
        } finally {
            laas.unlock();
        }
    }

    public int hentTeller() {
        laas.lock();
        try {
            return sharedCounter;
        } finally {
            laas.unlock();
        }
    }
}