单项选择题
A developer is designing a multi-tier application and discovers a need to hide the details of establishing and maintaining remote communications from the client. In addition， the application needs to find， in a transparent manner， the heterogeneous business components used to service the client’s requests. Which design patterns， working together， address these issues？（）
A. Business Delegate and Transfer Object
B. Business Delegate and Service Locator
C. Front Controller and Business Delegate
D. Intercepting Filter and Transfer Object
E. Model-View-Controller and Intercepting Filter
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单项选择题
Squeaky Beans Inc. hired an outside consultant to develop their web application. To finish the job quickly， the consultant created several dozen JSP pages that directly communicate with the database. The Squeaky business team has since purchased a set of business objects to model their system， and the Squeaky developer charged with maintaining the web application must now refactor all the JSPs to work with the new system. Which pattern can the developer use to solve this problem？（）
A. Transfer Object
B. Service Locator
C. Intercepting Filter
D. Business Delegate -
单项选择题
Adeveloperisdesigningawebapplicationthatmakesmanyfine-grainedremotedatarequestsforeachclientrequest.Duringtesting，thedeveloperdiscoversthatthevolumeofremoterequestssignificantlydegradesperformanceoftheapplication.Whichdesignpatternprovidesasolutionforthisproblem？（）
A. Flyweight
B. Transfer Object
C. Service Locator
D. Dispatcher View
E. Business Delegate
F. Model-View-Controller -
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
