创建型设计模式 培训(英文)

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1、BryanLi6/18/2007Common&DifferenceofDesignPattern™CreationalPatternandRefactorAgendaOODesignPrincipleOCP(Open-ClosedPrinciple)LSP(LiskovSubstitutionPrinciple)SRP(singleresponsibilityPrinciple)DIP(DependenceInversionPrinciple)ISP(InterfaceSegregationPrinciple)CARP(Composite/AggregateReusePrinciple)LoD

2、(LasodDemeter—LeastKnowledgePrinciple-LKP)DesignPatternCreationalPatternStructuralPatternBehavioralPatternAgendaCreationalPatternFactoryPatternSimpleFactoryFactoryMethodAbstractFactoryFactoryPatternSimpleFactorySimplymovedthecodethatisusedtocreateobjecttoanewclassCreator.FactoryPatternPizzaStoryYouw

3、anttoopenapizzastore,Assumethatyouorganizelikethis:SimplePatternpublicclassPizzaStore{PizzaorderPizza(Stringtype){Pizzapizza=null;if(type.equals("chees")){pizza=newCheesePizza();}elseif(type.equals("greek")){pizza=newGreekPizza();}elseif(type.equals("pepperoni")){pizza=newPepperoniPizza();}pizza.pre

4、pare();pizza.bake();pizza.cut();pizza.box();returnpizza;}}SimplePatternMendingdesignofpizzastorySimplePatternAddSimplePizzaFactoryClasspublicclassSimplePizzaFactory{publicstaticPizzacreatePizza(Stringtype){Pizzapizza=null;if(type.equals("chees")){pizza=newCheesePizza();}elseif(type.equals("greek")){

5、pizza=newGreekPizza();}elseif(type.equals("pepperoni")){pizza=newPepperoniPizza();}returnpizza;}}publicclassPizzaStore{SimplePizzaFactoryfactory;publicPizzaorderPizza(Stringtype){Pizzapizza=SimplePizzaFactory.createPizza(type);pizza.prepare();pizza.bake();pizza.cut();pizza.box();returnpizza;}}Simple

6、PatternFeatureyoudon'tneedtoinstantiateanobjecttomakeuseofthecreatemethodyoucan'tcreatesublcassandchangethebehaviorofthecreatemethodNottypicaldesignpattern--moreofaprogrammingidiomFadeFormatMergeCreatorintoConcreteProductSimplePatternAdvantageReusethecodethatcreateobjectDisadvantageIfproducthasanych

7、ange,Creatorclassshouldbeimpacted.OODesignPrincipleOCP:ifaddnewtypeofproduct,intheviewofclientandproduct,itconformtoOCP,butintheviewofFactoryCreator,itdoesnot.FactoryMethodDefineaninterfaceforcreating