September 2001
Beginner
698 pages
13h 46m
English
Content preview from Sams Teach Yourself Object Oriented Programming in 21 Days, Second EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Chapter 5. Inheritance: Time to Write Some Code
Inheritance is a powerful tool. Today you will explore the use of this new tool through a number of hands-on lab exercises. By the end of today’s lesson, you should feel a bit more comfortable with the theory presented on Day 4.
Today you will learn
How to use inheritance while programming
How abstract classes help you plan inheritance
About the importance of the “Is-A” and “Has-A”
How Java may have violated the “Is-A” and “Has-A” relationship
Lab 1: Simple Inheritance
Listing 5.1 presents the personified MoodyObject baseclass.
Example 5.1. MoodyObject.java
public class MoodyObject { // return the mood protected String getMood() { return "moody"; } // ask the object how it feels public void queryMood() { ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.