Here's a quick look at the three types of class loaders and everything you need to know to work with them in your Java programs ... class it finds if there are multiple versions.

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. Abstract classes ...

If you want to master functional programming ... your code — starting with how to use an actual class, and how to create very concise code with a lambda function. The Java Function interface is quite ...