Which interface must&#8194...

单项选择题Which interface must a class implement so that instances of the class are notified after any object is added to a session？（）

A. javax.servlet.http.HttpSessionListener
B. javax.servlet.http.HttpSessionValueListener
C. javax.servlet.http.HttpSessionBindingListener
D. javax.servlet.http.HttpSessionAttributeListener

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1.单项选择题 The tl：task tag supplies information about a single task while the tl：taskList tag does the final output. The tag handler for tl：taskList is TaskListTag. The tag handler for tl：task is TaskTag. Both tag handlers extend BodyTagSupport.
Which allows the tl：taskList tag to get the task names from its nested tl：task children？（）

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

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2.多项选择题Which three are valid values for the body-content attribute of a tag directive in a tag file？（）

A. EL
B. JSP
C. empty
D. dynamic
E. scriptless
F. tagdependent

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3.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 design pattern provides a solution for this problem？()

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

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4.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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5.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

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6.单项选择题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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7.单项选择题A developer is designing a multi-tier web application and discovers a need to log each incoming client request. Which two patterns， taken independently， provide a solution for this problem？（）

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

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8.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

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9.单项选择题Servlet A receives a request that it forwards to servlet B within another web application in the same web container. Servlet A needs to share data with servlet B and that data must not be visible to other servlets in A’s web application. In which object can the data that A shares with B be stored？（）

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

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10.多项选择题For which three events can web application event listeners be registered？（）

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

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