Design class to hold multiple instances of other classes?

Since you don't have operations specific to any car, you don't need to derive from Car. Let's assume that you have a Car class that has a Brand property, which is an enum. Then you could design your Customer class like this.

The easiest way is to create a base class for the different types of cars. All your specific cars (Mercedes, BMW) will derive from this. By using a common base class or interface, your Customer class can operate on the specific cars without having any understanding of them specifically.

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