oose_week 6- class diagram.ppt

8/15/2019 OOSE_Week 6- Class Diagram.ppt

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© SERGSoftware Design (UML)

Static Modeling using theUnified Modeling Language (UML)

Material based on[Booch99, Rambaugh99, acobson99, !owler9", Brown99#


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© SERG

Overview of UML Diagrams

Structural: element of spec. irrespective of time

• Class• Component• Deployment• Object• Composite structure• Package

Behavioral: behavioral features of a system / businessprocess• Activity• State machine• Use case• Interaction

nteraction: emphasi!e object interaction

• Communication"collaberation#

• Se$uence• Interaction overview

• Timing


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Classes

$lass%ame

attributes

o&erations

' class is a descri&tion of a set ofob ects that share the same attributes,o&erations, relationshi&s, and semantics

*ra&hicall+, a class is rendered as arectangle, usuall+ including its name,attributes, and o&erations in se&arate,designated com&artments


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Class Names

$lass%ame

attributes

o&erations

he name of the class is the onl+ re-uiredtag in the gra&hical re&resentation of aclass .t alwa+s a&&ears in the to&/mostcom&artment


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Class Attributes

0erson

name 1 String

address 1 'ddress birthdate 1 Datessn 1 .d

'n attribute is a named &ro&ert+ of aclass that describes the ob ect being modeled.n the class diagram, attributes a&&ear inthe second com&artment ust below thename/com&artment

'ttributes are usuall+ listed in theform1

attribute%ame 1 +&e


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Class Attributes (Cont’d)

0erson

2 name 1 String

3 address 1 'ddress3 birthdate 1 Date4 age 1 Date/ ssn 1 .d

'ttributes can be1

2 &ublic3 &rotected/ &ri5ate4 deri5ed


7/23© SERGSoftware Design (UML)

Class Operations

0erson

name 1 String

address 1 'ddress birthdate 1 Datessn 1 .d

eat

slee&wor6 &la+

Operations describe the class beha5ior

and a&&ear in the third com&artment



Depicting Classes

0erson

name 1 String birthdate 1 Datessn 1 .d

eat()

slee&()wor6() &la+()

7hen drawing a class, +ou needn8t show attributes and o&erationin e5er+ diagram

0erson

0erson

name

address birthdate

0erson

eat &la+

0erson



Relationships

.n UML, ob ect interconnections (logical or &h+sical), aremodeled as relationshi&s

here are three 6inds of relationshi&s in UML1

de&endencies

generali:ations

associationsaggregationcom&osition



Dependency Relationships

$ourseSchedule

add(c 1 $ourse)remo5e(c 1 $ourse)

$ourse

' dependency indicates a semantic relationshi& between two or more elements he de&endenc+ from CourseSchedule toCourse e;ists because Course is used in both the add andremove o&erations of CourseSchedule



Generalization Relationships

0erson' generalization connects a subclassto its su&erclass .t denotes an

inheritance of attributes and beha5ior from the su&erclass to the subclass andindicates a s&eciali:ation in the subclassof the more general su&erclass

Student



Association Relationships

.f two classes in a model need to communicate with each other,there must be lin6 between them

'n association denotes that lin6

.nstructor Student



Association Relationships (Cont’d)

7e can indicate the multiplicity of an association b+ addingmultiplicity adornments to the line denoting the association

he e;am&le indicates that a Student has one or more

nstructors 1

.nstructor Student< =




he e;am&le indicates that e5er+ nstructor has one or moreStudents 1

.nstructor Student< =




7e can also indicate the beha5ior of an ob ect in an association(i!e!" the role of an ob ect) using rolenames!

.nstructor Student< =< =

learns fromteaches




7e can also name the association

eamStudentmembershi&

< = < =




7e can s&ecif+ dual associations

eamStudent

member of

< =

&resident of < < =

< =


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Association Relationships (Cont’d)7e can model ob ects that contain other ob ects b+ wa+ ofs&ecial associations called aggregationsaggregations and compositions!compositions!

'n aggregation s&ecifies a whole/&art relationshi& between anaggregate (a whole) and a constituent &art, where the &art cane;ist inde&endentl+ from the aggregate 'ggregations aredenoted b+ a hollow/diamond adornment on the association

$ar >ngine

ransmission


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Association Relationships (Cont’d)' composition indicates a strong ownershi& and coincidentlifetime of &arts b+ the whole ( i!e!" the+ li5e and die as awhole) $om&ositions are denoted b+ a filled/diamondadornment on the association

7indow

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itlebar

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© SERG

Case Study &

' laborator+ has se5eral chemists who wor6 on one or more &ro ects $hemists (em&id, %ame, 0hone?no) also ma+ usecertain 6inds of e-ui&ments (Serial?no, cost) on each &ro ect(&ro ected, start?date) he organi:ation wishes to recordassign/date i e , the date when the gi5en e-ui&ment item wasassigned to a &articular $hemist wor6ing on a s&ecific &ro ect,as well as total number of hours the chemist has used thee-ui&ment for the &ro ect he chemist must be assigned to atleast one &ro ect and one e-ui&ment item Draw the class

diagram


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© SERG

Case Study '

0@S @!!.$> Management S+stem/ his sim&le websiteholds the account information of the users and their details .talso &ro5ide the details of the branches and also theem&lo+ees .t also &ro5ides the 5arious t+&e of bonds &resentand term &eriod Rules and regulations can be 5iewed b+an+one he user can login to this website his also de&icts tosend a telegram 5ia credit card Draw class diagram

oose_week 6- class diagram.ppt

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