Head First Object-Oriented Analysis and Design

Introduction

The longest journey begins with the first step!

And you should have already traveled a few miles from home!

(You should know something about object-oriented programming before starting this course.)

Things you should already know‣ How to program in some O-O language like Java, C++, or Ruby

‣ One can write horrible programs in an O-O language as easily as you can in a procedural language

‣ How to work as part of a team to build a non-trivial software system

‣ Tools used by poor programmers only help them write bad programs faster

Things to do before starting‣ Select your language

‣ Select your development environment

‣ Plan your schedule so you have time each week for course work

‣ Purchase the book (the authors thank you)

An object has…‣ State

‣ Changes over time

‣ Behavior

‣ What the object does in response to messages

‣ Identity

‣ What makes the object unique

State

DaveAge: 32Height: 6’ 2”

BrettAge: 35Height: 5’ 10”

GaryAge: 61Height: 5’ 8”

BehaviorGet the mail.Cook dinner.

Identity

Okay, which one of you wise guys is the real Poppini? I am the

great Poppini!I’m the

great Poppini!

No, I’m the great Poppini.

I am the great Poppini.

De great Poppini at-a your service.

Classes

‣ Define the properties and behavior of objects

‣ Can have behavior and properties that are defined in the class but are independent of the individual objects

InheritanceMom’s eyes

Dad’s smile

Dad’s sports obsession

Mom’s love of ROCK

Polymorphism‣ Different type of objects can respond to the same message

‣ The actual method that executes is not determined until run time

‣ Dynamic (or late) binding

Encapsulation

…Two… Three. And Abracadabra, the rabbit is gone!

Wait. How’d he do that? Where’s the bunny gone?