In what ways are subtypes different from subclasses in usage?

Question

A subtype is established when a class is linked by means of extending or implementing. Subtypes are also used for generics.

How can I differentiate subtyping from su

Answer 1

For once, Wikipedia gives a very straight answer to the question:

http://en.wikipedia.org/wiki/Subtype_polymorphism

Subtyping should not be confused with the notion of (class or object) inheritance from object-oriented languages; subtyping is a relation between types (interfaces in object-oriented parlance) whereas inheritance is a relation between implementations stemming from a language feature that allows new objects to be created from existing ones. In a number of object-oriented languages, subtyping is called interface inheritance.

In short, subtyping occurs when you derive an interface (method signatures/access points/ways of reacting to the outside world) from another whereas subclassing occurs when you derive an implementation (methods, attributes/internal state and inside logic) of a class from another class through inheritance.

This terminology is not often used in this way and type usually refers to the data type.