Question

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 classes' responsibilities are as the following:

-to know the make, the model, 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 parkingTicket Class: this class should simulated a parking ticket. The class's responsibilities are as follows:

-to report the make, model, and the license number of the illegally parked car

-to report the amount of the fine, which is $175 for the first hour and the part of an hour that the car illegally parked, plus $25 for every additional hour or part of the hour.

-to report the name and the badge number of the police officer issuing the ticket.

The policeOfficer Class: the class should simulate the officer inspecting parked cars. the class's responsibilities as follow:

-to know the police officers' name and badge number

-to examine a parkedCar object and parkingMeter object and determine whether the car's time has expired.

-to issue a parking ticket ( generate a parking ticket object) if the car's time has expired

Write a java program that demonstrate how these classes collaborate.

Answer 1

class ParkedCar
{
    public String make;
    public String model;
    public String license_number;
    public int num_of_minutes_parking;

    ParkedCar(String make, String model, String license_number, int time){
        this.make = make;
        this.model = model;
        this.license_number = license_number;
        this.num_of_minutes_parking = time;
    }

    public void setTime(int time){
        this.num_of_minutes_parking = time;
    }

}

class ParkingMeter
{
    public int parking_time_bought;

    ParkingMeter(int time){
        this.parking_time_bought = time;
    }
}

class ParkingTicket
{
    public ParkedCar car_instance;
    public ParkingMeter ticket_instance;
    public String police_name;
    public String badge_number;

    ParkingTicket(ParkedCar car_instance, ParkingMeter ticket_instance, String police_name, String badge_number)
    {
        this.car_instance = car_instance;
        this.ticket_instance = ticket_instance;
        this.police_name = police_name;
        this.badge_number = badge_number;
    }

    public void reportFine()
    {
        float fine = 0;
        float extra_time = car_instance.num_of_minutes_parking - ticket_instance.parking_time_bought;
        //System.out.println(extra_time);
        if(extra_time <= 60)    fine = 175*((float)extra_time/60);
        else    fine = 175 + 25*(float)(extra_time - 60)/60;
        System.out.println("Fine: Rs. "+( (float)Math.round(fine*100) / 100));
    }

    public void reportCar()
    {
        System.out.println("Car Details\nMake: "+car_instance.make+"\nModel: "+car_instance.model+"\nLicense Number: "+car_instance.license_number);
    }

    public void reportPoliceOfficer()
    {
        System.out.println("Police Officer Details\nName: "+police_name+"\nBadge Number: "+badge_number);
    }
}


class PoliceOfficer
{
    public String name;
    public String badge_number;
    private ParkingTicket newTicket;

    PoliceOfficer(String name, String badge_number)
    {
        this.name = name;
        this.badge_number = badge_number;
    }

    public boolean examine(ParkedCar car_instance, ParkingMeter ticket_instance)
    {
        if(ticket_instance.parking_time_bought < car_instance.num_of_minutes_parking)   return true;
        return false;
    }

    public void issueTicket(ParkedCar car_instance, ParkingMeter ticket_instance)
    {
        this.newTicket = new ParkingTicket(car_instance, ticket_instance, this.name, this.badge_number);
        System.out.println("Parking Ticket Issued: ");
        this.newTicket.reportFine();
        this.newTicket.reportCar();
        this.newTicket.reportPoliceOfficer();
    }
}

public class SampleTest
{
    public static void main(String [] args)
    {
        ParkedCar car_instance = new ParkedCar("Tesla", "Model S", "17BAN0135", 75);
        ParkingMeter ticket_instance = new ParkingMeter(50);
        PoliceOfficer po = new PoliceOfficer("Sgt. Adams K", "S14");
        if(po.examine(car_instance, ticket_instance))   po.issueTicket(car_instance, ticket_instance);
    }
}