Java How to Program, Early Objects, 11th Edition

3.1 Introduction1

1. This chapter depends on the terminology and concepts of object-oriented programming introduced in Section 1.5, Introduction to Object Technology.

In Chapter 2, you worked with existing classes, objects and methods. You used the predefined standard output object System.out, invoking its methods print, println and printf to display information on the screen. You used the existing Scanner class to create an object that reads into memory integer data typed by the user at the keyboard. Throughout the book, you’ll use many more preexisting classes and objects—this is one of the great strengths of Java as an object-oriented programming language.

In this chapter, you’ll create your own classes and methods. Each new class you create ...