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

public class SaksMonitor {
    
    private Lock laas = new ReentrantLock();
    private ArrayList<Saks> saksHaug =  new ArrayList<>(); 

    public void settInn(Saks saks) {
        laas.lock();
        try {
            saksHaug.add(saks);
        }
        finally {
            laas.unlock();
        }
    } 

    public int antall() {
        return saksHaug.size();
    }
}