subclass : Java Glossary

This is the reverse of the way a mathematician might look at it. From the point of view of mathematical set theory, Dalmatian has a superset of the methods of Dog.

I’d prefer to call them the less ambiguous base and extended / derived class, rather than super and sub class. To help you remember, "Mom makes super pie" — the mother original class is the superclass.

Another way to remember it is that the set of all Dalmatian objects is a subset (subclass) of the set of all Dog objects.

Yet another way to help you remember is the super keyword as in:

super.somemethod();

Yet another way to help you remember is to think of a class tree dangling down from Object at the top. The superclass is above, the subclass below.