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JAVAEE平台简介(翻译).doc

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南华大学 计算机科学与技术学院 实验报告 （2013-2014学年度第二学期） 课程名称：JAVAEE平台软件开发 课程内容：JAVAEE平台简介（翻译） 姓名学号 专业班级 地点教师 原文： 2.1.1TheBeanContextasaparticipantinnestedstructure（嵌套结构） OneoftherolesoftheBeanContextistointroducethenotion（概念）ofahierarchicalnesting（嵌套层次）orstructureofBeanContextandJavaBeaninstances（实例）.InordertomodelthisstructuretheBeanContextmustexposeAPIthatdefinestherelationshipsinthestructureorhierarchy. TheBeanContextexposesitssuperstructure（上层建筑）throughimplementation（实施）ofthejava.beans.beancontext.BeanContextChildinterface(asdescribedlater).Thisinterfaceallowsthediscoveryandmanipulation（操作）ofaBeanContext’snestingBeanContext,andthusintroducesafacilitytocreateahierarchyofBeanContexts. TheBeanContextexposesitssubstructurethroughanumberofinterfacemethodsmodeledbythejava.util.Collectioninterfacesemantics（语义） BeanContextsarerequiredtoimplementallthemandatory（强制的）CollectionAPI’s,withthefollowingparticularsemanticsforadd()andremove():. Theadd()methodmaybeinvokedinordertonestanewObject,BeanContextChild,orBeanContextwithinthetargetBeanContext.Aconformantadd()implementationis requiredtoadhereto（坚持）thefollowingsemantics: •SynchronizeontheBeanContext.globalHierarchyLock. •EachchildobjectshallappearonlyonceinthesetofchildrenforagivenBeanContext. IftheinstanceisalreadyamemberoftheBeanContextthenthemethodshallreturnFalse. •Eachvalid（有效的）childshallbeaddedtothesetofchildrenofagivensourceBeanContext,andthusshallappearinthesetofchildren,obtainedthrougheitherthetoArray(),oriterator()methods,untilsuchtimeasthatchildisdeletedfromthenestingBeanContextviaaninvocationofremove(),removeAll(),retainAll(),orclear() •Asthechildisaddedtothesetofnestedchildren,andwherethatchildimplementthejava.beans.beancontext.BeanContextChildinterface(orBeanContextProxy,seelater fordetails),theBeanContextshallinvokethesetBeanContext()methoduponthatchild, withareferencetoitself.Uponinvocation,achildmay,ifitisforsomereasonunableorunpreparedtofunctioninthatBeanContext,throwaPropertyVetoExceptiontonotifythenestingBeanContex