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1、------==ProudlyPresentedbyMODELER==------preface.fmPagexvWednesday,June6,20014:18PMPrefaceDesignpatternsandobject-orientedprogramming.Theyholdsuchpromisetomakeyourlifeasasoftwaredesigneranddevelopereas-ier.Theirterminologyisbandiedabouteverydayinthetechnical
2、andeventhepopularpress.Butitcanbehardtolearnthem,tobecomeproficientwiththem,tounderstandwhatisreallygoingon.Perhapsyouhavebeenusinganobject-orientedorobject-basedlanguageforyears.Haveyoulearnedthatthetruepowerofobjectsisnotinheritancebutisin“encapsulatingbeh
3、aviors”?Perhapsyouarecuriousaboutdesignpatternsandhavefoundtheliteratureabittooesotericandhigh-falutin.Ifso,thisbookisforyou.Itisbasedonyearsofteachingthismaterialtosoftwaredevelopers,bothexperiencedandnewtoobjectorientation.Itisbaseduponthebelief—andourexpe
4、rience—thatonceyouunderstandthebasicprinciplesandmotivationsthatunderlietheseconcepts,whytheyaredoingwhattheydo,yourlearningcurvewillbeincrediblyshorter.Andinourdiscussionofdesignpatterns,youwillunder-standthetruemindsetofobjectorientation,whichisanecessityb
5、eforeyoucanbecomeproficient.Asyoureadthisbook,youwillgainasolidunderstandingofthetenmostessentialdesignpatterns.Youwilllearnthatdesignpat-ternsdonotexistontheirown,butaresupposedtoworkincon-certwithotherdesignpatternstohelpyoucreatemorerobustapplications.You
6、willgainenoughofafoundationthatyouwillbeabletoreadthedesignpatternliterature,ifyouwantto,andpossi-blydiscoverpatternsonyourown.Mostimportantly,youwillbebetterequippedtocreateflexibleandcompletesoftwarethatiseasiertomaintain.xvpreface.fmPagexviWednesday,June6
7、,20014:18PMxviPrefaceFromObjectOrientationtoPatternstoTrueObjectOrientationInmanyways,thisbookisaretellingofmypersonalexperiencelearningdesignpatterns.Priortostudyingdesignpatterns,Iconsid-eredmyselftobereasonablyexpertinobject-orientedanalysisanddesign.Mytr
8、ackrecordhadincludedseveralfairlyimpressivedesignsandimplementationsinmanyindustries.IknewC++andwasbeginningtolearnJava.Theobjectsinmycodewerewell-formedandtightlyencapsulated.Icoulddesignexcell
