One of the most often used terms, API, was thoroughly discussed in this chapter, as well as the related topics of object factories, overriding, hiding, and overloading. Also, the use of the keywords this and super was explored in detail and demonstrated during the explanation of constructors. The chapter concluded with an overview of the keyword final and its use for local variables, fields, methods, and classes.
In the next chapter, we will describe package and class member accessibility (also called visibility), which will help us to expand on one of the key object-oriented programming concepts, encapsulation. It will lay the foundation for our discussion of object-oriented design principles.
