countList[obligation.getId()] = count - 1;
countList[obligation.getId()] = (short)(count - 1);
	public void remove(Obligation obligation) throws NonexistentObligationException {		int count = countList[obligation.getId()];		if (count <= 0)			throw new NonexistentObligationException(obligation);		invalidate();		countList[obligation.getId()] = count - 1;	}