public int countNumberOfCars() {
        int countCars = 0;
        for (int i = 0; i < shortParkingSpace.length; i++) {
            if (shortParkingSpace[i].getIcon() == carImg) {

                countCars++;

            }
        }
        r.setNumberOfCars(countCars);
        return countCars;
    }

    public double addRevenue() {
        double revenue = r.getNumberOfCars() * r.getCost();
        return revenue;

    }

    public String revenueToString() {

        DecimalFormat df = new DecimalFormat("£0.00");
        String s = df.format(addRevenue());

        return s;
    }