单项选择题

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 Helper
B.Front Controller
C.Composite View
D.Intercepting Filter
E.Business Delegate

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多项选择题

Which two are characteristics of the Front Controller pattern？（）

A.It simplifies remote interfaces to distributed objects.
B.It promotes cleaner application partitioning and encourages reuse.
C.It provides an initial point of contact for handling all related requests.
D.It reduces maintainability due to the increased complexity of the design.
E.It provides loosely coupled handlers that can be combined in various permutations.

单项选择题

A developer is designing a web application that must support multiple interfaces， including：
an XML web service for B2B HTML for web-based clients WML for wireless customers.
Which designpattern provides a solution for this problem？（）

A.Session Facade
B.Business Delegate
C.Data Access Object
D.Model-View-Controller
E.Chain of Responsibility

单项选择题

A developer is designing a web application which extensively uses EJBs and JMS. The developer finds thatthere is a lot of duplicated code to build the JNDI contexts to access the beans and queues. Further，because of the complexity， there are numerous errors in the code.
Which J2EE design pattern provides asolution for this problem？（）

A.Command
B.Transfer Object
C.Service Locator
D.Session Facade
E.Business Delegate