单项选择题

A. FlyweightB. Transfer ObjectC. Service LocatorD. Disp……

A developer is designing a web application that makes many fine-grained remote data requests for each client request. During testing， the developer discovers that the volume of remote requests significantly degrades performance of the application. Which design pattern provides a solution for this problem？（）

A. Flyweight
B. Transfer Object
C. Service Locator
D. Dispatcher View
E. Business Delegate
F. Model-View-Controller

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单项选择题Adeveloperisdesigningamulti-tierwebapplicationanddiscoversaneedtologeachincomingclientrequest.Whichtwopatterns，takenindependently，provideasolutionforthisproblem？（）

A. Transfer Object
B. Service Locator
C. Front Controller
D. Intercepting Filter
E. Business Delegate
F. Model-View-Controller

单项选择题Which is the correct web application deployment descriptor element for defining a servlet initialization parameter？（）

A.A
B.B
C.C
D.D

单项选择题ServletAreceivesarequestthatitforwardstoservletBwithinanotherwebapplicationinthesamewebcontainer.ServletAneedstosharedatawithservletBandthatdatamustnotbevisibletootherservletsinA’swebapplication.InwhichobjectcanthedatathatAshareswithBbestored？（）

A. HttpSession
B. ServletConfig
C. ServletContext
D. HttpServletRequest
E. HttpServletResponse

多项选择题Forwhichthreeeventscanwebapplicationeventlistenersberegistered？（）

A. when a session is created
B. after a servlet is destroyed
C. when a session has timed out
D. when a cookie has been created
E. when a servlet has forwarded a request
F. when a session attribute value is changed

多项选择题AdeveloperchoosestoavoidusingSingleThreadModelbutwantstoensurethatdataisupdatedinathread-safemanner.Whichtwocansupportthisdesigngoal？（）

A. Store the data in a vocal variable.
B. Store the data in an instance variable.
C. Store the data in the HttpSession object.
D. Store the data in the ServletContext object.
E. Store the data in the ServletRequest object.