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.

Understanding type compatibility is fundamental to writing good Java programs, but the interplay of variances between Java language elements can seem highly academic to the uninitiated. This article ...

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 ...