[设计内容模式解析]Design Patterns Explained - A New Perspective on Object-Oriented Design - 第一版教材.pdf

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1、------==ProudlyPresentedbyMODELER==------PrefaceDesignpatternsandobject-orientedprogramming.Theyholdsuchpromisetomakeyourlifeasasoftwaredesigneranddevelopereas-ier.Theirterminologyisbandiedabouteverydayinthetechnicalandeventhepopularpress.Butitcanbehardtolearnthem,tobecomeprofi

2、cientwiththem,tounderstandwhatisreallygoingon.Perhapsyouhavebeenusinganobject-orientedorobject-basedlanguageforyears.Haveyoulearnedthatthetruepowerofobjectsisnotinheritancebutisin“encapsulatingbehaviors”?Perhapsyouarecuriousaboutdesignpatternsandhavefoundtheliteratureabittooeso

3、tericandhigh-falutin.Ifso,thisbookisforyou.Itisbasedonyearsofteachingthismaterialtosoftwaredevelopers,bothexperiencedandnewtoobjectorientation.Itisbaseduponthebelief—andourexperience—thatonceyouunderstandthebasicprinciplesandmotivationsthatunderlietheseconcepts,whytheyaredoingw

4、hattheydo,yourlearningcurvewillbeincrediblyshorter.Andinourdiscussionofdesignpatterns,youwillunder-standthetruemindsetofobjectorientation,whichisanecessitybeforeyoucanbecomeproficient.Asyoureadthisbook,youwillgainasolidunderstandingofthetenmostessentialdesignpatterns.Youwilllea

5、rnthatdesignpat-ternsdonotexistontheirown,butaresupposedtoworkincon-certwithotherdesignpatternstohelpyoucreatemorerobustapplications.Youwillgainenoughofafoundationthatyouwillbeabletoreadthedesignpatternliterature,ifyouwantto,andpossi-blydiscoverpatternsonyourown.Mostimportantly

6、,youwillbebetterequippedtocreateflexibleandcompletesoftwarethatiseasiertomaintain.xvxviPrefaceFromObjectOrientationtoPatternstoTrueObjectOrientationInmanyways,thisbookisaretellingofmypersonalexperiencelearningdesignpatterns.Priortostudyingdesignpatterns,Iconsid-eredmyselftobere

7、asonablyexpertinobject-orientedanalysisanddesign.Mytrackrecordhadincludedseveralfairlyimpressivedesignsandimplementationsinmanyindustries.IknewC++andwasbeginningtolearnJava.Theobjectsinmycodewerewell-formedandtightlyencapsulated.Icoulddesignexcellentdataabstractionsforinheritan

8、cehierarchies.IthoughtIknewobject-orientation.Now,look