Java™ How to Program, Seventh Edition

3. Introduction to Classes and Objects

You will see something new. Two things. And I call them Thing One and Thing Two.

—Dr. Theodor Seuss Geisel

Nothing can have value without being an object of utility.

—Karl Marx

Your public servants serve you right.

—Adlai E. Stevenson

Knowing how to answer one who speaks, To reply to one who sends a message.

—Amenemope

Objectives

In this chapter you will learn: What classes, objects, methods and instance variables are. How to declare a class and use it to create an object. How to declare methods in a class to implement the class’s behaviors. How to declare instance variables in a class to implement ...