Java supports class reuse through inheritance and composition.This two-part tutorial teaches you how to use inheritance in your Java programs. What you’ll learn in this Java tutorial ...

This is an example of Java inheritance with method overriding. First, we extend the Animal class to create a new Cat class. Next, we override the Animal class’s emitSound() ...

Marking a class as final prevents all inheritance, by anyone -- even the original developer cannot inherit from one of their own final classes. It's a powerful but potentially messy design constraint.