Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

Although interfaces and abstract classes each define a type and the set of operations on that type, use the type-defining characteristics of abstract classes with caution.

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 ...

Abstract classes can also have final, nonfinal, static and nonstatic variables, whereas an interface has only static and final variables. Additionally, abstract methods can define public, protected ...