Primitive types represent the simplest, most direct way to represent data in code. Even the most complicated classes in Java can be flattened down to nothing more than the set of primitive data types ...

Everything in Java is an object ... of the referential overhead of objects. Moreover, all data ultimately resolves to these eight primitive types in a program. Classes are just a kind of ...

Java programmers ... In contrast, some data structures exist as generic storage vessels for other data structures. For example, an array can store primitive values or object references.