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

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

多项选择题Whichthreearevalidvaluesforthebody-contentattributeofatagdirectiveinatagfile？（）

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

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

单项选择题Adeveloperisdesigningamulti-tierapplicationanddiscoversaneedtohidethedetailsofestablishingandmaintainingremotecommunicationsfromtheclient.Inaddition，theapplicationneedstofind，inatransparentmanner，theheterogeneousbusinesscomponentsusedtoservicetheclient’srequests.Whichdesignpatterns，workingtogether，addresstheseissues？（）

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

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