談?wù)刯ava 反射機(jī)制（談?wù)刯ava 反射機(jī)制）

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1、談?wù)刯ava反射機(jī)制（談?wù)刯ava反射機(jī)制）.txt38aboutthejavareflectionmechanismwhenthecloudscoveredthesky,thepessimistseesthe"darkpressuretodestroy"theoptimistseeis"energy-savingLinkai".Inanyadversity,aslongasyoukeepoptimistic,youcanalwaysfindsuchastrangestrawberry.Person,p=new,Person();Whatisthis?Ofcourseis

2、toinstantiateanobject.Buttheobjecthasaproblem,thatistoknowtheclassnamecaninstantiateitsobject,sothatweintheapplicationwillbelimited.Sothereisnosuchawaythatwedon'tknowwhatthisclasscanbeinstantiateditistheobject?ThankGoodness!Fortunately,weusedjava,Javaprovidesthismechanism.1)the.Javaprogra

3、mcanobtainbytecodeinformationforanyclassatruntime,includingclassmodifiers(public,static,etc.),baseclasses(superclass,superclass),interfacesimplemented,fields,methods,andsoon2).Javaprogramsatruntimecancreateobjectinstancesoftheclass,changethefieldcontentoftheobject,andcalltheobjectmethodba

4、sedonbytecodeinformationThemechanismiscalledreflectiontechnology.Soyoucanimaginethemirror,aswelookinthemirror,themirrorandtheemergenceofa(analogymaynotbeappropriate,butenoughtoexpressmeaning).Thereflectiontechniqueprovidesageneraldynamiclinkercomponentmethodisnotnecessarytotargethardencod

5、ingtheproceduresrequiredtosourceprogram,sothatwecancreateaflexibleprogram.ThereflectionmechanismofJavaisimplementedbyreflectionAPI,whichallowstheprogramtoobtaininternalinformationofanyclasswithagivennameduringtherun.ThereflectionAPIisinthejava.lang.reflectpackage.Themaincategoriesareasfol

6、lows:1).Constructorclass:amethodfordescribingtheconstructionofaclass2).Fieldclass:amembervariableusedtodescribeaclass3).Methodclass:amethodusedtodescribeaclass4).Modiferclass:amodifierusedtodescribeelementswithinaclass5).Array:isusedtomanipulatearraysConstructor,Field,Methodofthethreeclas

7、sesareJVM(virtualmachine)createdatruntime,usedtoexpressthecorrespondingloadingmemberclass.Thethreeclassimplementsthejava.lang.reflect.Memberinterface,Memberinterfacedefinesinformationaccessclassmembersorconstructionmethods.TousethereflectionAPI,mustfirstinstancetoma