Factory method: Defines an interface for creating objects, but lets subclasses decide which class to instantiate. Abstract factory: Provides an interface for creating families of related or ...

I'm trying to model some data in code and i'm a bit confused on what should be an abstract class vs an interface, and why i can't override an abstract property with a property of an inherited type ...

The abstract modifier and nonpublic constructor of the Displayable class force developers to use its concrete subclasses in the LCDUI, which do contain the rendering logic.