Beginner Java converting an arraylist object to output String value?

Question

I am coding to get a parking ticket simulator working. I have many classes, the ones relevant are a ParkedCar class, ParkingTicket class and a policeOfficer class. Now i wrote a method where I take the licensePlateNumber variable from ParkedCar as a parameter, and I have to get the ParkingTicket count for a car. I am getting an error in the test class which i have below, it wont compile because of this. The method is as follows

PoliceOfficer class

public int getParkingTicketsCountForACar(ParkedCar licensePlateNumber){
int numberOfTickets = 0;
String carPlateNumber = licensePlateNumber.getLicensePlateNumber();
for(ParkingTicket ticket: ticketList){
if(carPlateNumber.equalsIgnoreCase(ticket.getCarLicensePlateNumber())){
numberOfTickets++
}
return numberOfTickets;
}

Test class

public void testGetParkingTicketsCountForACar() {

    PoliceOfficer p = new PoliceOfficer("Adam White","RCMP5225");
    ParkedCar car = new ParkedCar("Bob Smith", "Porsche", 2015, "1A2B3C", 65);
    ParkingMeter meter = new ParkingMeter("Burnaby",false,10.5,60);
    p.issueParkingTicket(car, meter);
    ParkedCar car2 = new ParkedCar("Scott Marks", "Ford", 2010, "MYCAR", 30);
    meter.setNumberOfPurchasedMinutes(1);
    p.issueParkingTicket(car2, meter);
    car.setNumberOfMinutesParked(125);
    meter.setNumberOfPurchasedMinutes(20);
    p.issueParkingTicket(car, meter);
    assertEquals(2,p.getParkingTicketsCountForACar("1a2B3c"));

I am getting an error at the very end "1a2b3c" saying java.lang.String cannot be converted to ParkedCar. Is there a way to fix this without using the String override method?

getParkingTicketsCountForACar expects an argument of type "ParkedCar" but you're passing a String, which is why your code doesn't compile. Seem like in this case you'd want to call p.getParkingTicketsCountForACar(car) — Christophe L
– Christophe L, Commented Apr 2, 2020 at 7:14

Alufoil · Accepted Answer · 2020-04-02 07:26:05Z

2

you are passing String value of licensePlateNumber, and in the method

public int getParkingTicketsCountForACar(ParkedCar licensePlateNumber){}

you expect input of type ParkedCar, and then u you are extracting the licensePlateNumber. you can shrink the method just to:

public int getParkingTicketsCountForACar(String licensePlateNumber){
    for(ParkingTicket ticket: ticketList){
    if(licensePlateNumber.equalsIgnoreCase(ticket.getCarLicensePlateNumber())){
        numberOfTickets++
    }
    return numberOfTickets;
}

answered Apr 2, 2020 at 7:26

Alufoil

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Артем Хворов · Accepted Answer · 2020-04-02 07:13:28Z

0

This method accepts ParkedCar type

public int getParkingTicketsCountForACar(ParkedCar licensePlateNumber){}

But you trying to pass String

assertEquals(2,p.getParkingTicketsCountForACar("1a2B3c"));

answered Apr 2, 2020 at 7:13

Артем Хворов

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1 Comment

onesnapthanos Over a year ago

If i convert the parameter to a String then how would I access the licensePlateNumber input?

bkis · Accepted Answer · 2020-04-02 07:26:48Z

0

You either have to change your method

public int getParkingTicketsCountForACar(ParkedCar licensePlateNumber){ ...

to

public int getParkingTicketsCountForACar(String carPlateNumber){ ...

and just remove the second line in the method,
OR you'll have to pass the method the actual ParkedCar object reference.

answered Apr 2, 2020 at 7:26

bkis

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