Java interfaces are different from classes, and it’s important to know how to use their special properties in your Java programs. This tutorial introduces the difference between classes and ...

The difference between a class and an interface, in this case, is that interfaces don’t keep state. If you attempt multiple inheritance like I have below, the code won’t compile: ...

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 ...