chap 4 - system design

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1、2010/1/8ShanghaiJiaoTongUniversityObjtObject-OitdAliOrientedAnalysisandDidDesignChapter4ObjectOrientedSystemDesign上海交通大学软件工程中心Chapter4ObjectOrientedSystemDesign4.1OODesignOverview4.2ThePrinciplesofObject-OrientedDesign4.3ArchitecturalDesignandUMLPackageDiagram4.4ComponentDesignandU

2、MLComponentDiagram&CompositeStructurediagram4.5ClassDesignandUMLStateMachineDiagramObjectOrientedAnalysisandDesign212010/1/8OODesignOverviewObjectOrientedAnalysisandDesign35.1OODesignOverviewUnderstandingDesignAnalysisVersusDesignObjectOrientedDesignObjectOrientedAnalysisandDesi

3、gn422010/1/8UnderstandingDesignAprocessthatusestheproductsofanalysistoproduceaspecificationforimplementingasystem.AlogicaldescriptionofhowasystemwillAlogicaldescriptionofhowasystemwillwork.Emphasizesaconceptualsolution(insoftwareandhardware)thatfulfillstherequirements,ratherthan

4、itsimplementation.“dotherightthing(analysis),anddothethingright(design)”.ObjectOrientedAnalysisandDesign5AnalysisVersusDesignAnalysisDesignFocusonFocusonunderstandingtheunderstandingtheproblemsoltilutionIdealizeddesignOperationsandBehaviorattributesSystemstructurePerforma

5、nceFunctionalClosetorealcoderequirementsObjjyectlifecyclesAsmallmodelNonfunctionalrequirementsAlargemodelObjectOrientedAnalysisandDesign632010/1/8ObjectOrientedDesignThespecificationofalogicalsoftwaresolutionintermsofsoftwareobjects,suchastheirclasses,attributes,methods,and

6、collaborations.Duringobject-orienteddesign(orsimply,objectdesign)thereisanemphasisondefiningsoftwareobjectsandhowtheycollaboratetofulfilltherequirements.ObjectOrientedAnalysisandDesign7ThePrinciplesofObject-OrientedDesignObjectOrientedAnalysisandDesign842010/1/85.2ThePrinciplesofO

7、bject-OrientedDesignSRP:SingleResponsibilityPrincipleOCP:TheOpen-ClosedPrincipleLSP:TheLisoSubsuoskovSubstitutionPrincpecipleDIP:TheDependencyInversionPrincipleISP:TheInterfaceSegregationPrincipleObjectOrientedAnalysisandDesign9SRP:TheSingle–ResponsibilityPrincipleAClassshoul

8、dhaveonlyonereasontochange