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单选题
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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考题 单选题A developer is designing the presentation tier for a web application that relies on a complex session bean.The session bean is still being developed and the APIs for it are NOT finalized. Any changes to the sessionbean API directly impacts the development of the presentation tier.  Which design pattern provides a meansto manage the uncertainty in the API?()A View HelperB Front ControllerC Composite ViewD Intercepting FilterE Business Delegate