Java Reference
In-Depth Information
Moving Toward Object‐
Oriented Programming 
What you Will learn in this chapter:
What is Object‐Oriented Programming and why it is useful
How to work with classes and objects and the differences between
them
How variables are defined and what is meant by their scope
How methods are defined and what is meant by their scope
Some of the frequently used standard classes
Wrox.com code doWnloads for this chapter
The wrox.com code downloads for this chapter are found at www.wrox.com/go/
beginningjavaprogramming on the Download Code tab. The code is in the Chapter 4
download and individually named according to the names throughout the chapter.
Now that you're familiar with programming in general, understand Java's general concepts, and have
set up your development environment, it's time you delve into Java for real. Chapter 2 highlighted
the fact that Java is an object‐oriented programming language, meaning that objects, with their
data variables and methods, are first‐class citizens in Java and that defining a well-thought‐out class
architecture is the foundation of any solid program or application you will develop.
This chapter is organized as follows. The first section provides a general overview of the basic
concepts of the object‐oriented programming paradigm. Next, it discusses how to work with
classes and objects in Java. This is then further explored in the following sections, which
explain in more detail how to define data (variables) and behaviors (methods) for classes. The
final section in this chapter provides an overview of helpful built‐in classes in Java SE, which
will be used throughout this topic as well.
 
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