Covariance and contravariance might seem esoteric, but you'll need these concepts more than ever as the Java language evolves. Get started with type dependency in array types, generic types, and ...

Get a deep dive into using method references in your Java programs, including stream operations, event listeners, and constructors and factories.

This Java naming conventions tutorial explains how and when to use snake, kebab, Pascal and camel case with variables, methods, functions and classes.