What you’ll learn in this Java tutorial. The first half of this introduction to Java inheritance teaches you how to use the extends keyword to derive a child class from a parent ... Final classes.

We will focus on the relationship between polymorphism and Java inheritance. The main thing to keep in mind is that polymorphism requires an inheritance or an interface implementation. You can see ...

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.