Learn the difference between classes and interfaces once and for all, then get started declaring, implementing, ... For example, Cloneable (see Inheritance in Java, Part 2) ...

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 ...

Sealed classes make Java an even more powerful and expressive language and set the stage for even more sophisticated techniques such as pattern matching, which we'll explore in a subsequent article. A ...