Call another class's method from a different class, help

Moose Pickard

Hi,

me again

I want to call a method from another class.

I have

class Collection {

private ListCars = new List();

        public void remove(Car car) {
        Cars.Remove(car);
        }

class RentedCar {
        public void ReturnCar(Car car) {
        Collection.Cars.Remove(car;
        }
}

I want to use Collection class method remove in RentedCar class. How do I do this?

7 Replies

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Felipe Ramos16y ago
Accepted answer
I understand, but because you were talking about a car rental service I didn't think you needed to extend the car class to a sports car or anything like that. For instance a car object can contain make, model, and year so there is no need to have a specialize class for other fields if all you care about is keeping track of basic car information. If you are learning I would say not to over think on the design, think simple and something that works.

Car
-Car Info
-Status {InStock, Rented, etc } for easy querying.
Customer
-Customer Info
RepositoryService
-Save/Retrieve information
RentalService
-Create a transaction for each rental/return.
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Moose Pickard16y ago
Yes you are correct.

The different car classes were relicts. I now see that I could use only one car class. I can use the rent object to represent both rentedIn and rentedOut cars, and the absence of it to represent the cars that are none of the aformentioned.

I updated the diagram: http://www.flickr.com/photos/54126948@N08/5011989040/
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Moose Pickard16y ago
Thank you Felipe for the code. It is however too advanced for me at this point. So I must work trought it, to understand it.

I made the Car class abstract because it isn't supposed to be instantiated. I wanted it to be the parent of 2 car class objects so the subclasses could just inherit the variables and methods. For an example If I had 2 or more animals: dog, cat, hippo, and I wanted it to inherit common methods and variables from a superclass, then I would create an animal class. I would also make it abstract because it wouldn't make sense to instantiate an animal.

I actually can't understand why my own structure couldn't work.
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Felipe Ramos16y ago
Moose Sam is correct if you want you can have several interfaces implemented, but after taking a look at your diagram I didn't understand why you are making you car class abstract. I think the hardest part is going to get all the transaction piece correctly. I put a some classes together to see if it helps you.
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Sam Hobbs16y ago
I am not sure what you need to do but note that you can inherit from many interfaces, so you can inherit from IList and also from one class.
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Moose Pickard16y ago
Thank you
But the problem is that In my real code the RentedCar is already inheriting from a class and in C# that can be done only once.
I don't really know where to put the inherit code. I can't create an instance from below to higher.Only from high to low: my user object has an instance of CarRental, CarRental has instances of Cars. Or maybe I shouldn't at all call the CarRental method from there, maybe call both methods from form. How could I suit your solution into this?
I made an updated UML: http://www.flickr.com/photos/54126948@N08/5009156825/

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Felipe Ramos16y ago
Moose unless your Collection class is static you will need to have a reference in RentedCar. I will say do something like below so you have the extra functionality from a generic list and any extra functions you may want to add.

RentedCars : List
{
public RentedCars()
{
// Load From DB/XML/CLOUD
foreach (Car car in Source)
this.Add(car);
}
}
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