5 structural modeling

8/18/2019 5 Structural Modeling

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5-Structural Modeling17 September 2015Review Use Case

Class Diagram


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riting !"ective Use Case


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#ctivit$ Diagram %w&enneeded'


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#ctivit$Diagram!(ample


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Structural Models

• Represents t&e data used ) created b$a s$stem

• Describes data captured ) &ow data

relate to eac& ot&er

• #re logical models

• #re tec&nolog$-independent %in #nal$sis

*&ase'

• +$picall$ used ,or +o .e/ S$stem


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Relations&ips in StructuralModeling

• eneraliation is a 3ind o,/e(4 !mplo$ee is a 3ind o, *erson

•

#ggregation is a part o,/e(4 Door is a part o, a Car

• #ssociation catc& all/e(4 *atient ) #ppointment are

#ssociated


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#nt&ropomorp&ism

• +o treat classes as i, t&e$ were&uman4

• &o or w&at are $ou

• &at do $ou 3now

• &at can $ou do

• 6elps to create CRC Cards


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Structural Model 2 *arts

14 CRC Card %Class Responsibilit$Collaboration'

8 ritten ,orm used to document responsibilities )collaborations o, a class

8 Used to build Class Diagram

24 Class Diagram %similar to !R Diagram'8 rap&ical model o, classes ) relations&ips

among classes

CRC Cards are created frst;Class Diagrams are then created rom CRCCards


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CRC CardsFront:

Class name: ID: Type:

Description:

Responsibilities: Collaborators:

Back:

Attributes:

Relationships:

Generalization (a-kin-o!":

A##re#ation (has-parts":

$ther Associations:


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Class Diagram Components

# C9#SS

#: #++R;.U+!

#:


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Class Diagram


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:otes on #ttributes

• Derived #ttributes >/calculated ,rom ot&er attributese(4 #ge

•

*ublic #ttributes =/:ot &idden ,rom an$ ot&er obAect

• *rotected #ttributes B/6idden ,rom ot&er obAects %e(cept subclasses'

• *rivate #ttributes -/6idden ,rom all ot&er obAects


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:otes on Relations&ips• # Class can be related to itsel,

• Relations&ips involve Multiplicit$• #lso called Cardinality • ero to


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Multiplicit$


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#ssociation Class


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eneraliation


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#ggregation %9ogical' )Composition %*&$sical'

9ogical implies t&at it is possible ,or a

part be associated wit& multiplew&oles or t&at is relativel$ simple ,ort&e part to be removed ,rom t&ew&ole

*&$sical implies t&at t&e part can

be associated wit& onl$ a singlew&ole4


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+e(tual #nal$sis o,ReEuirements


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*ractice !(ercises14 Describe t&e

,ollowing classdiagram wit&$our own word

24 Develop a usecase and a classdiagram ,or caseno4 F %Picnics R

Us' in 5-usecase4doc

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