design patterns 1

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1、DesignPatterns--OOdesignPrincipleFoglightZhuhaiDashboardTeamAgendaWhatisObject-orienteddesignprincipleObject-orienteddesignprinciplesOpen-ClosedPrinciple(OCP)SingleResponsibilityPrinciple(SRP)LiskovSubstitutionPrinciple(LSP)InterfaceSegregationPrincipl

2、e(ISP)DependencyInversionPrinciple(DIP)ReferencesWhatisObject-orienteddesignprincipleObject-orienteddesignistheprocessofplanningasystemofinteractingobjectsforthepurposeofsolvingasoftwareproblem.Theexperienceandregularitywhenweuseobject-orienteddesignwh

3、ichcanhelpprogrammertocreateasystemthatiseasytomaintainandextendovertime.Object-orienteddesignprinciples（1）Fiveprinciplesofclassdesign:Open-ClosedPrinciple(OCP:开合原则)SingleResponsibilityPrinciple(SRP:单职原则)LiskovSubstitutionPrinciple(LSP:里氏置换原则)Interface

4、SegregationPrinciple(ISP:接口隔离原则)DependencyInversionPrinciple(DIP:依赖倒置原则)Object-orienteddesignprinciples（2）Threeprinciplesofpackagecohesion:ReuseReleaseEquivalencePrinciple(REP:重用发布等价原则)CommonClosurePrinciple(CCP:公共封闭原则)CommonReusePrinciple(CRP:公共复用原则)T

5、hreeprinciplesofpackagecoupling:AcyclicDependenciesPrinciple(ADP:无环依赖原则)StableDependenciesPrinciple(SDP:稳定依赖原则)StableAbstractionsPrinciple(SAP:稳定抽象原则)Object-orienteddesignprinciplesOpen-ClosedPrinciple(OCP)SingleResponsibilityPrinciple(SRP)LiskovSubsti

6、tutionPrinciple(LSP)InterfaceSegregationPrinciple(ISP)DependencyInversionPrinciple(DIP)Open-ClosedPrinciple(OCP)Softwareentities(classes,modules,functions,etc.)shouldbeopenforextension,butclosedformodificationAbstractionistheKeyEncapsulatetheVariationI

7、nheritanceandaggregationIs-AVSHas-AExampleviolatedOCPclassShape{stringtype(“circle”,“square”,…);}VoiddrawAllShapes(ListShapes){for(Shapeshape:Shapes){if(shape.type==“circle”){drawCircle(shape);}elseif(shape.type==“square”){drawSquare(shape);}…}}Refac

8、torittofollowOCPInterfaceShape{pbulicvoiddraw();}classCircleimplementsShape{}classSquareimplementsShape{}VoiddrawAllShapes(ListShapes){for(Shapeshape:Shapes){shape.draw();}}BadExampleinDMEprojectGetVirtualMachinesfromTopologyObjectsObj