Pattern matching simplifies your Java code by allowing you to check an object’s type and use it in one clean step. No more messy type checking and casting; Java does it for you automatically.

Okay, I've got two objects. There's the Hand object, and the Finger object. These are fake. The mappings are correct, I believe, everything works fine usually, I think I'm just misunderstanding ...

Take your coding to the next level by learning advanced programming with generics. Here's how to use generic methods with type inference, type parameters, and wildcards in your Java programs.