public class Operator{
    private int carsParked;
    private int vacantCarSpaces;
    private Car car;
    private Parking parking;


    public Operator(int carsParked, int vacantCarSpaces){
        this.carsParked = carsParked;
        this.vacantCarSpaces = vacantCarSpaces;
    }

    public void setCarsParked(int carsParked){
        this.carsParked = carsParked;
    }
    public int getCarsParked(){
        return this.carsParked;
    }
    public void setVacantCarSpaces(int vacantCarSpaces){
        this.vacantCarSpaces = vacantCarSpaces;
    }
    public int getVacantCarSpaces(){
        return this.vacantCarSpaces;
    }

    public void parkCar(int numOfCars){
        if(numOfCars < vacantCarSpaces && numOfCars > 0){
            vacantCarSpaces -= numOfCars;
            carsParked += numOfCars;
            System.out.println(numOfCars + " cars parked successfully !");
        }else{
            numOfCars = 0;
            throw new IllegalArgumentException("Something went wrong");
        }
    }

    public void removeCar(int numOfCars){
        if(numOfCars > 0){
            vacantCarSpaces += numOfCars;
            carsParked -= numOfCars;
            System.out.println(numOfCars + " cars removed successfully !");

        }else{
            numOfCars = 0;
            throw new IllegalArgumentException("Something went wrong");
        }
    }

    public void showReport(String arrivedTime, Parking parking, Car car){
        parking = new Parking(....);
        car = new Car(....);
        arrivedTime = "...";
        System.out.println("arrive time = " + arrivedTime + " parking place/number = " +
        parking.getParkingNumber() + ". cost of parking = " + parking.getParkingCost());
    }
}