ooad lecture 1 by craige larman

8/19/2019 OOAD Lecture 1 by craige larman

1/18

Introduction to OOAD

Lecture # 1


2/18

OO Objectives

We want a development method which:Is able to guide us through analysis design

and implementation using one consistent

paradigm throughout those phasesIs less li!ely to generate errors

"acilitates reuse o designs and code


3/18

Analysis $ Design

AnalysisInvestigation o problem and requirements

rather than a solution%

&%g% 'e(uirements analysis and OO analysis%

DesignIt emphasi)es a conceptual solution that ulills

the re(uirements%&%g% Database design or OO design

Implementation e*presses the true and completereali)ed design


4/18

Object Oriented Analysis +OOA,

OOA is -a method o analysis that

examines requirements rom the

perspectives o the classes and objects%.

+/ooch 100,

&mphasis is on inding and describing

conceptual objects in the problem

domain%


5/18

Object Oriented Design +OOD,

OOD is -a method o design

encompassing the process o OO

decomposition and a notation or depicting

both logical and physical as well as static and dynamic models o the system%.

+/ooch 100,

&mphasis is on defining softwareobjects and how they collaborate to ulill

system re(uirements


6/18

What is OO analysis and design2

&ssence o OO analysis 3 consider a

problem domain rom the perspective o

objects +real world things concepts,

&ssence o OO design 3 define the

solution as a collection o sotware

objects +allocating responsibilities to

objects,


7/18

&*amples3 Library I4

OO Analysis 3 in the case o the library

inormation systems one would find

concepts li!e book, library, patron

OO Design 3 emphasis on deining the

software objects5 ultimately these objects

are implemented in some programming

language5 Book may have a methodnamed print.


8/18

&*ample 3 contd%

Book

title

public class Book{

private String title;

public Chapter getChapter(int) {...}}

domain concept visualization ofdomain concept

representation in anobject-orientedprogramming language


9/18

"light I4

Plane

tailNumber

public class Plane{

private String tailNumber;

public List getFlightHistory() {...}}

domain concept

visualization ofdomain concept

representation in anobject-orientedprogramming language


10/18


11/18

/usiness processes 3 contd%

Identiying and recording the business processes

as use cases is not actually an object oriented

activity5 though a necessary irst step%


12/18

'oles in the organi)ation

Identify the roles of people who will be

involved in the business processes

In OO terms - domain analysis

&*amples 3 customer library assistantprogrammer navigator sensor etc%


13/18

Who does what2

Business processes and roles +actors,5

time to determine how to ulill the

processes and who does these processes

in OO terms - object oriented design5

assigning responsibilities to the various

sotware objects

oten e*pressed in class diagrams


14/18

In 4ummary%%%


15/18

4imple e*ample to see big picture

Deine use cases

Deine domain model

Deine interaction diagrams

Deine design class diagrams

Define domain

model

Define

Interaction

diagrams

Define design

class diagramsDefine use

cases


16/18

4hort &*ample

Dice game A sotware simulates a player rolling two dice% I

the total is seven they win5 otherwise they

lose%


17/18

Deine use cases

Use cases

8arrative descriptions o domain processes in a

structured prose ormat

9hey are stories or scenarios o how people use

the system

Use case: Play a game

Actors: Player

Description: Player requests to roll the dice. System

presents results: If the dice face value totals seven,

player wins; otherwise, player loses.


18/18

Deine conceptual model

OO Analysis concernsspeciication o the problem domain

identiication o concepts +objects,

Decomposition o the problem domainincludes identiication o objects attributes associations

results can be e*pressed in conceptual

model

ooad lecture 1 by craige larman

Documents