Object-oriented programming gives us modifiers, which control the visibility of members and methods. In some languages, like Java, we have modifiers such as private and public.

In this first half of “Understanding the Java Persistence API,” you saw how you can apply object-oriented concepts like inheritance and event callbacks using JPA.

This lesson starts a new segment about Object-Oriented Programming (OOP) — an important set of concepts critical to understanding any modern software, not just modern embedded software.