Question

Project: Parking Ticket Simulator
Problem Description:
For this assignment you will design a set of classes that work together to simulate a police officer issuing a parking ticket. The classes you should design are:

Answer 1

/**
 * This class should simulate a parked car, see exercise for description of
 * responsibilities
 * 
 */
class ParkedCar {

    private String make;
    private String model;
    private String color;
    private String licenseNumber;
    private int minutesParked;

    //omitted getter/setters

}

class ParkingMeter {

    private int minutesPurchased; 

    //omitted getter/setters
}

class PoliceOfficer {

    private String name;
    private String badgeNumber;

    public ParkingTicket patrol(ParkedCar car, ParkingMeter meter) {

        ParkingTicket ticket = null;

        // Calculate the total number of minutes parked over minutes
        // purchased
        int illegalMinutes = car.getMinutesParked()
                - meter.getMinutesPurchased();

        // if illegalMinutes, give ticket
        if (illegalMinutes > 0) {
            // Yes, it is illegally parked.
            ticket = new ParkingTicket(car, this, illegalMinutes);
        }

        return ticket;
    }

    //omitted getter/setters
}

class ParkingTicket {

    private ParkedCar car;
    private PoliceOfficer officer;
    private double fine;
    private int minutes;

    public final double BASE_FINE = 25.0;
    public final double HOURLY_FINE = 10.0;

    public ParkingTicket(ParkedCar car, PoliceOfficer officer, int minutes) {
        super();
        this.car = car;
        this.officer = officer;
        this.minutes = minutes;

        calculateFine();
    }

    private void calculateFine() {

        double hours = minutes / 60.0;
        int hoursAsInt = (int) hours;

        if ((hours - hoursAsInt) > 0) {
            hoursAsInt++;
        }

        // Assign the base fine.
        fine = BASE_FINE;

        // Add the additional hourly fines.
        fine += (hoursAsInt * HOURLY_FINE);
    }

    //omitted getter/setters
}

public static void main(String[] args) {

    // A green car was parked for 125 minutes
    ParkingTicketSimulator parkingTicketSimulator = new ParkingTicketSimulator();
    ParkedCar car = parkingTicketSimulator.new ParkedCar("Toyota", "2005",
            "Green", "ABC123", 125);

    // 60 minutes of time was purchased
    ParkingMeter meter = parkingTicketSimulator.new ParkingMeter(60);

    // Officer Jack was on duty
    PoliceOfficer officer = parkingTicketSimulator.new PoliceOfficer(
            "Sargent Jack Johnson", "8909");

    ParkingTicket ticket = officer.patrol(car, meter);

    // Did the officer issue a ticket?
    if (ticket != null) {
        System.out.println(ticket);
    } else {
        System.out.println("No crimes committed!");
    }
}