OReilly.Head.First.Object.Oriented.Analysis.and.Design.2006.pdf

Chapter 1. well-designed apps rock: Great Software Begins Here

Table of Contents

Chapter 1. well-designed apps rock: Great Software Begins Here ................ 1

Section 1.1. Rock and roll is forever! ............................................................................................................................................... 2

Section 1.2. Rick's shiny new application... .................................................................................................................................... 3

Section 1.3. Here what the code for Guitar.java looks like. ............................................................................................................ 4

Section 1.4. And Inventory.java... ................................................................................................................................................... 5

Section 1.5. But then Rick started losing customers.... .................................................................................................................. 6

Section 1.6. What's the FIRST thing you'd change?. ...................................................................................................................... 8

Section 1.7. Great software is... more than just one thing ............................................................................................................ 12

Section 1.8. Great software in 3 easy steps ................................................................................................................................... 13

Section 1.9. Remember Rick? Remember his lost customers? ..................................................................................................... 14

Section 1.10. So let's apply our 3 steps: ......................................................................................................................................... 14

Section 1.11. Ditching String comparisons .................................................................................................................................... 16

Section 1.12. Rick's customers want choices! ................................................................................................................................ 21

Section 1.13. Test drive .................................................................................................................................................................. 23

Section 1.14. Back to our steps ...................................................................................................................................................... 24

Section 1.15. Looking for problems ............................................................................................................................................... 25

Section 1.16. Analyze the search() method ................................................................................................................................... 26

Section 1.17. Now update your own code ..................................................................................................................................... 30

Section 1.18. Update the Inventory class ...................................................................................................................................... 32

Section 1.19. Getting ready for another test drive ........................................................................................................................ 33

Section 1.20. Getting back to Rick's app... .................................................................................................................................... 35

Section 1.21. Design once, design twice ........................................................................................................................................ 36

Section 1.22. Let's make sure Inventory.java is (really) well-designed ........................................................................................ 37

Section 1.23. Design Puzzle ........................................................................................................................................................... 42

Section 1.24. Design Puzzle Solution ............................................................................................................................................ 44

Section 1.25. One last test drive (and an app ready for reuse) ..................................................................................................... 46

Section 1.26. What we did ............................................................................................................................................................. 47

Section 1.27. Remember this poor guy? ....................................................................................................................................... 48

Section 1.28. OOA&D is about writing great software, not doing a bunch of paperwork! .......................................................... 49

Section 1.29. OOA&D Cross ........................................................................................................................................................... 51

Chapter 1. well-designed apps rock: Great Software Begins Here

Head First Object-Oriented Analysis and Design By Brett McLaughlin, Gary Pollice, David

West ISBN: 0596008678 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Chapter 1. well-designed apps rock: Great Software Begins Here Page 1

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well-designed apps rock

Great Software

Begins Here

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So how do you really write great software? It’s never easy

WU\LQJWR¿JXUHRXW where to start . Does the application actually do what

it’s supposed to ? And what about things like duplicate code—that can’t be

good, can it? It’s usually pretty hard to know ZKDW\RXVKRXOGZRUNRQ¿UVW ,

and still make sure you don’t screw everything else up in the process. No

worries here, though. By the time you’re done with this chapter, you’ll know

how to write great software , and be well on your way to improving the way

you develop applications forever. Finally, you’ll understand why OOA&D is a

four-letter word that your mother actually

wants

you to know about.

this is a new chapter

Chapter 1. well-designed apps rock: Great Software Begins Here

Head First Object-Oriented Analysis and Design By Brett McLaughlin, Gary Pollice, David

West ISBN: 0596008678 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Chapter 1. well-designed apps rock: Great Software Begins Here Page 2

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the sounds of wood and steel

Rock and roll is forever!

There’s nothing better than the sound of a killer guitar in the hands

of a great player, and Rick’s Guitars specializes in finding the perfect

instrument for his discerning customers.

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Meet Rick , guita r

afi cionad o, an d own er of a

h igh-e nd gu itar s hop.

Just a few months ago, Rick decided to throw out his paper-based

system for keeping track of guitars, and start using a computer-based

system to store his inventory. He hired a popular programming firm,

Down and Dirty Coding, and they’ve already built him an inventory

management app. He’s even had the firm build him a new search

tool to help him match up a customer to their dream instrument.

&KDSWHU

Chapter 1. well-designed apps rock: Great Software Begins Here

Head First Object-Oriented Analysis and Design By Brett McLaughlin, Gary Pollice, David

West ISBN: 0596008678 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

Chapter 1. well-designed apps rock: Great Software Begins Here Page 3

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Here’s the application that the programming firm built for Rick... they’ve

put together a system to completely replace all of Rick’s handwritten

notes, and help him match his customers with the perfect guitar. Here’s

the UML class diagram they gave Rick to show him what they did:

Th e inv entor y sto res a list

o f all the guita rs th at R ick

cur rentl y has avail able.

Guitar

serialNumber: String

price: double

builder: String

model: String

type: String

backWood: String

topWood: String

getSerialNumber(): String

getPrice(): double

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getBuilder(): String

getModel(): String

getType(): String

getBackWood(): String

getTopWood(): String

Inventory

guitars: List

addGuitar(String, double, String, String, String,

String, String)

getGuitar(String): Guitar

search(Guitar): Guitar

New to Objectville?

If you’re new to object oriented programming, haven’t heard of UML before,

or aren’t sure about the diagram above, it’s OK! We’ve prepared a special

“Welcome to Objectville” care package for you to get you started. Flip to the

back of the book, and read Appendix II—we promise you’ll be glad you did.

Then come back here, and this will all make a lot more sense.

you are here

Chapter 1. well-designed apps rock: Great Software Begins Here

Head First Object-Oriented Analysis and Design By Brett McLaughlin, Gary Pollice, David

West ISBN: 0596008678 Publisher: O'Reilly

Prepared for Ann Cherkis, Safari ID: maottw@gmail.com

This PDF is exclusively for your use in accordance with the Safari Terms of Service. No part of it may be reproduced or transmitted in any form by any means without the prior

written permission for reprints and excerpts from the publisher. Redistribution or other use that violates the fair use priviledge under U.S. copyright laws (see 17 USC107) or that

otherwise violates the Safari Terms of Service is strictly prohibited.

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