4. Class Diagram

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ObjectOriented

Analysis,

,

CSE 307 Presentation 8CSE 307 Presentation 8 11


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Overview

Defineobjectmodelingandexplain itsbenefits.

Recognize

and

understand

the

basic

concepts

and

constructs

ofobjectmodeling.

.

Evolveabusinessrequirementsusecasemodelintoasystem

analysisuse

case

model.

Discoverobjectsandclasses,andtheirrelationships.

Constructaclassdiagram.



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Ob ectorientedanal sis OOA ana roach

usedto studyexistingobjects toseeiftheycanbereusedor

definenewormodifiedobjects thatwillbecombined

withexisting

objects

into

auseful

business

computing

Objectmodeling atechniqueforidentifying

objectswithin

the

systems

environment

and

the

relationshipsbetweenthoseobjects.



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modelingconventions

that

is

used

to

specify

objects.

developingsystemsonlyanotationthatisnow

widel acce tedasastandardforob ect

modeling.



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UseCaseModelDiagrams

Static

Structure

Diagrams Classdiagrams

Objectdiagrams

InteractionDiagrams Sequencediagrams

Collaborationdia rams

StateDiagrams Statechartdiagrams

Activit dia rams

ImplementationDiagrams Componentdiagrams



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ClientClass name compartment

companyEmail

companyFaxAttributes compartment

companyTelephone

O erations com artment

Class



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FoodCo:Client

companyAddress=Evans Farm, Norfolk

compartment

[email protected]

companyFax=01589-008636Attribute valuescompany ame= oo o

companyTelephone=01589-008638

have operations



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whileclasses

are

generally

permanent.

.

Objectinstances

can

be

updated.



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Partof

the

essential

description

of

aclass

T ecommonstructureo w att ec asscan

know Eachobjecthasitsownvalue foreach

attributeinitsclass



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Yellow Partridge:Client

A link is a logical connectionbetween two objects

FoodCo:Client Grace Chia:StaffMember

Soong Motor Co:Client Carlos Moncada:StaffMember

CSE 307 Presentation 8CSE 307 Presentation 8 1010Links


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Association role Association

StaffMember

Client

companyAddressstaffContact

staffNo

staffStartDate

companyEmail

companyFax

companyName

liaises with

companyTelephone

Association name

name should be read


Association


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instances.

fromthesameclass.

L n canconnect nstanceso tse .



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Multiplicityis

the

range

of

permitted

Represententerprise (orbusiness) rules

Anybankcustomermayhaveoneormoreaccounts

Everyaccountisforone,andonlyone,customer



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StaffMember

ClientMultiplicities

staffName

company ress

companyEmail

com an Fax

1 0..*

staffStartDate companyName

companyTelephone

a ses w

Exactly one staff member liaises with each client


A staff member may liaise with zero, one or more clients


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ClassDiagram:MultiplicityNotationsMultiplicity Notations Example

Exactly one 1

blank

A student studies in exactly one

department

ero or one .. e may ave zero or one

patient

..

*

more IC

*..

teachers

S ecific Ran e 0..3 A student ma borrow at most 3

books from the library



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Anessential

part

of

the

description

of

aclass

T ecommon e aviours are ya o jects

of

the

class Servicesthatobjectsofaclasscanprovideto

otherobjects



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ClassDiagram:Operations Operationsdescribe

whatinstancesofa Campaign

class

can

do: Setorrevealattribute

actualCostcampaignFinishDatecam ai nStartDate

values

Performcalculations

completionDatedatePaid

estimatedCost

Sendmessagestootherobjects

e

checkCampaignBudget ( )getCampaignContribution ( )

Createor

destroy

links setCompleted ( )



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Thevalues

of

the

attributes

An

object

may

show

different

behavior

in

eren s a e

Statetransitionisinitiatedbyanevent

Statecan

be

changed

only

by

executing

an

operation



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Ref3:

Section

7.3.2

(page

165).

focusoncertainkindofthings.

rolesobjectscanplay:

Boundar ob ects

Entityobjects

Controlobjects



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Modelsinteraction

between

the

system

and

Mayincludeinterfacestoothersoftwareor

devices

Maintaskistomanagethetransferofinformationacrosss stemboundaries



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Notationsforboundaryclass

User Interface::AddAdvertUI


startInterface( )

assi nStaff

startInterface( )

assi nStaff

selectClient( )

selectCampaign( )

selectClient( )

selectCampaign( )




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Modelsinformation

and

their

related

behavior

, event



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Modelthe

coordination,

sequencing,

transactions

Oneusecaseshouldresultinonecontrolclass



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showClientCampaigns( )

on ro :: ver

createNewAdvert( )showClientCampaigns( )

showCampaignAdverts( )

createNewAdvert


AddAvert


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Use-case Use-casepay fee register

RegisterPayFee

PayFeeUI

ShowResultUI


eg s ra on ee u en n o ne n o ourse n o esu


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Directlybased

on

knowledge

of

the

application

Byproducingaseparateclassdiagramforeach

use case then assemblin them into a sin le

model(anAnalysisClassModel)



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Identifythe

likely

classes

involved

(the

use

Drawacollaborationdiagramthatfulfilsthe

needs of the use case

Translatethiscollaborationintoaclassdia ram

Repeatfor

other

use

cases



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FromUseCasetoClasses:Step1

Use Case : Assign staff to a campaign

Actor Action System Response

1. None 2. Display List of Client Name

3. Select the client name 4. List the titles of thecampaigns related to that client

5. Select the relevant campaign 6. Display list of staff not

ass gne o a campa gn7. Select a staff member to 8. Present a message confirming



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Anumber

of

tests

help

to

check

whether

a

Isitbeyondthescopeofthesystem?

Does tre ertot esystemasaw o e

Doesitduplicateanotherclass?

Isit

too

vague?

(Moreonnextslide)



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Isit

really

an

attribute?

Isitreallyanassociation?

,

potentialclassinsomeotherway(ordonot



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Client

StaffMember



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Initialcollaboration

diagram

1 2 3

Campaign

:Client :Campaign :StaffMember

Manager



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Addingboundary

and

control

classes

1 2

Campaign

:AssignStaffUI :AssignStaff

Manager 5

43


: en : ampa gn : a em er


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Addingmessages

1 2

Campaign

Manager


7: AssignStaff()




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Finalizing4: selectClient() 5: showClientCampaign()

10: assignStaff()

11: asssignStaff()

2: startInterface()

Campaign

Manager


13: AssignStaff()



l


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FromUseCasetoClasses:Step4>AssignStaffUI

AssignStaff

assignStaff()

selectClient()

selectCam ai n

getClientCampaign()

showCampaignStaff()

Client

companyName

Campaign

site

StaffMemver

staffNo

1 ** 1

companyAddress

getClientCampaign()

campaignStartDate

getCampaignStaff()

staffName

getStaff()


ge en s ass gn a ass gn a

getStaffDetails()


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tomodel

interaction

between

objects

Brainstormtheobjects

A ocatetoteammem ers

Roleplaytheinteraction



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Class Name:

CollaborationsResponsibilities

Responsibilities of a class

are listed in this section.

o a orat ons w t ot er

classes are listed here,

together with a brief

description of the purpose ofthe collaboration.



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Class Name Client

espons tes o a oratons

Provide clientinformation.

campaign details.

Class Name Campaign

campaigns.

Responsibilities Collaborations

Provide campaign

information. .Add a new advert.

.Advert constructs new object.

Class Name Advert

Provide advert details.

Construct adverts.



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strategyfor

distributing

responsibility

among

Forexample:

ac ro ep ayer r es o e azy

Persuadesotherplayerstheirclassshouldaccept

MayusePaperCASEtodocumenttheassoc at onsan n s



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ThankYou

&

KeepSmiling

CSE 307 PresentationCSE 307 Presentation 88 4242

4. Class Diagram

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