You examined local variables, method parameters, and variable scope. You learned how to add data to classes using instance variables, and how that data is contained in each instance.

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.

This post explains how to use variables in Java. Learn the primitive types (and what that means) and just why variables are so important for any coding!

Java SE 10 (March 2018) introduced type inference for local variables. Java Language Architect Brian Goetz explains the feature.