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Java For Dummies, 8th Edition
book

Java For Dummies, 8th Edition

by Barry Burd
April 2022
Beginner content levelBeginner
512 pages
11h 32m
English
For Dummies
Content preview from Java For Dummies, 8th Edition

Chapter 15

Fancy Reference Types

IN THIS CHAPTER

Bullet Writing and using a Java interface

Bullet Working with abstract classes

In previous chapters, you may have read about the things that full-time and part-time employees have in common. In particular, both the FullTimeEmployee and PartTimeEmployee classes can extend the Employee class. That's nice to know if you're running a small business, but what if you're not running a business? What if you're taking care of house pets?

This chapter explores the care of house pets and other burning issues.

Java's Types

Chapter 4 explains that Java has these two kinds of types:

  • Primitive types: Java has a total of eight primitive types: The four you use most often are int, double, boolean, and char.
  • Reference types: Java's API has thousands of reference types, and, when you write a Java program, you define new reference types.

    Java's String type is a reference type. So are Java's Scanner, JFrame, ArrayList, and File types. My DummiesFrame is a reference type. In Chapter 8, you create your own Employee, FullTimeEmployee, and PartTimeEmployee reference types. Your first You'll love Java! program has a main method inside of a class, and that class is a reference type. You may not realize it, but every array belongs to a reference type.

In Java, reference ...

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Publisher Resources

ISBN: 9781119861645Purchase Link