Question

It’s regarding Abstract Factory pattern.

As we know that there are 2 ways we can use i.e.

1. Either create the instance of concrete class directly or
2. Provide an interface by which we can access concrete class

Can someone tell the advantage/dis-advantages that if I use option 1 then these are issues that can occur or vice-versa with real time example if possible.

Thanks in advance…

Answer 1

If you have a concrete class, which is not subclassed, and you are confident that it will never be, then you can just instantiate it as in your option 1 – for this there is no need for a factory.

If you have an interface / abstract class with several concrete subclasses, and you want to be able to vary the implementations without tying the client to any of them – this is when you use a factory (or dependency injection).