As a customer you want to order your coffee and not bother what the barista is going to do (i.e. which objects he is going to call when he crafts that wonderfully smelling elixir for you).

Add methods to the barista class so that he can decide which objects to instantiate when you are wasking for your morning treat.

Define an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses.