Then you’ll get started with using instance variables in your Java classes. Called primitive types, integral and ... “Don’t access your object’s data directly; use its methods.” ...

Even the most complicated classes in Java can be flattened down to nothing more than the set of primitive data types they represent. But primitive types aren’t objects, and that presents a problem.

A programming language structure ... today, object-oriented programming (OOP) languages, such as C++ and Java, provide a formal set of rules for creating and managing objects. The data are stored ...