Parking ticket simulator program

The problem

For this assignment you will design a set of classes that work together to simulate a police officer issuing a parking ticket. You should design the following classes:

The ParkedCar Class: This class should simulate a parked car. The class's responsibilities are as follows:

To know the car's make, model, color, license number, and the number of minutes that the car has been parked.

The ParkingMeter Class: This class should simulate a parking meter. The class's only responsibility is as follows:

To know the number of minutes of parking time that has been purchased.

The PoliceOfficer Class: This class should simulate a police officer inspecting parked cars. The class's responsibilities are as follows:

To know the police officer's name and badge number
To examine a ParkedCar object and a ParkingMeter object, and determine whether the car's time has expired
To issue a parking ticket (generate a ParkingTicket object) if the car's time has expired

The ParkingTicket Class: This class should simulate a parking ticket. The class's responsibilities are as follows:

To report the make, model, color, and license number of the illegally parked car
To report the amount of the fine, which is $25 for the first hour or part of an hour that the car is illegally parked, plus $10 for every additional hour or part hour that the car is illegally parked, plus $l0 for every additional hour or part of an hour that the car is illegally parked
To report the name and badge number of the police officer issuing the ticket

Write a program that demonstrates how these classes collaborate.

Breaking it down

Parked car

/**
 * 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

}

ParkingMeter

/**
 * This class should simulate a parking ticket, see exercise for description
 * of responsibilities
 *
 */
class ParkingMeter {

    private int minutesPurchased;

    //omitted getter/setters
}

PoliceOfficer

/**
 * This class should simulate a police officer inspecting parked cars.
 *
 */
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
}

ParkingTicket

/**
 * This class should simulate a parking ticket.
 *
 */
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
}

Main Method

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!");
    }
}

Output

ParkingTicket [car=com.levelup.java.exercises.beginner.ParkingTicketSimulator$ParkedCar@7f31245a, officer=com.levelup.java.exercises.beginner.ParkingTicketSimulator$PoliceOfficer@6d6f6e28, fine=45.0, minutes=65, BASE_FINE=25.0, HOURLY_FINE=10.0]

Level Up

Write a java unit test for each set of logic in PoliceOfficer and Parking ticket class
Fix program output so it isn't calling the the ParkingTicket toString class
What are two ways to handle the if (ticket != null), hint check out guava optional and java 8 optional