Abstract classes and interfaces in Java serve fundamentally different purposes. Learn the differences between these Java language elements and how to use them in your programs.

As I was thinking about the remaining differences between Java interfaces and abstract classes in a JDK 8 world, I decided to see what the Java Tutorial had to say on this.

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 ...