public void deposit(int value) {
		if(value >= 0) {
			notifyPropertyChangeListeners(money, money + value);
			money += value;
		} else {
			IllegalArgumentException ex = new IllegalArgumentException(
					"You can't deposit a negative number of dollars!");
			log.throwing(getClass().getSimpleName(), "deposit(int)", ex);
			throw ex;
		}
	}