FrameWorks(Components patterns)

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1、HowframeworkscomparetootherFrameworks=object-orientedreusetechniques.(Components+Patterns)Frameworksareanobject-orientedreusetechnique.Theysharemanycharacteris-ticswithreusetechniquesingeneral[8],andobject-orientedreusetechniquesinparticular.Althoughtheyhavebeenusedsuccessfullyforsometim

2、e,andareanimpor-tantpartofthecultureoflong-timeobject-orienteddevelopers,theyarenotwellunder-stoodoutsidetheobject-orientedcommunityandareoftenmisused.Moreover,thereisconfusionaboutwhetherframeworksarelarge-scalepatterns,orwhethertheyarejustanotherkindofcomponent.Eventhedefinitionsoffram

3、eworksvary.Thedefi-nitionweusemostis“aframeworkisareusableRalphE.JohnsondesignofallorpartofasystemthatisrepresentedbyasetofabstractclassesandthewaytheirinstancesTheidealreusetechnologyprovidescomponentsinteract.”Anothercommondefinitionis“aframe-thatcanbeeasilyconnectedtomakeanewsystem.wo

4、rkistheskeletonofanapplicationthatcanbecus-Thesoftwaredeveloperdoesnothavetoknowhowtomizedbyanapplicationdeveloper.”Thesearenotthecomponentisimplemented,anditiseasyfortheconflictingdefinitions;thefirstdescribesthestruc-developertolearnhowtouseit.Theresultingsys-tureofaframeworkwhilethese

5、conddescribesitspur-temwillbeefficient,easytomaintain,andreliable.pose.Nevertheless,theypointoutthedifficultyofTheelectricpowersystemislikethat;youcanbuydefiningframeworksclearly.atoasterfromonestoreandatelevisionfromFrameworksareimportant,andcontinuallybecomeanother,andtheywillbothworka

6、teitheryourmoreimportant.SystemslikeOLE,OpenDoc,andhomeoroffice.MostpeopledonotknowOhm’sDSOMareframeworks;Javaisspreadingnewframe-Law,yettheyhavenotroubleconnectinganewworkslikeAWTandBeans.Mostcommerciallyavail-toastertothepowersystem.Unfortunately,softwareableframeworksseemtobefortechni

7、caldomainssuchisnotnearlyascomposableastheelectricpowerasuserinterfacesordistribution,andmostapplication-system.specificframeworksareproprietary.ButthesteadyriseTheoriginalvisionofsoftwarereusewasbasedonofframeworksmeanseverysoftwaredevelopershouldcomponents.Inthebeginnin