多项选择题
A custom JSP tag must be able to support an arbitrary number of attributes whose names are unknown when the tag class is designed.
Which two are true？ （）
A. A
B. The echo tag handler must define the setAttribute （String key， String value） method
C. The
D. The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.IterationTag interface
E. The class implementing the echo tag handler must implement the javax.sevlet.jsp.tagext.DynamicAttributes interface
相关考题
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多项选择题
Whichthe twoarevalidandequivalent？（）
A.
B.
C.
D.
E.
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单项选择题
A developer is designing a web application which extensively uses EJBs and JMS. The developer finds that there 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 a solution for this problem？（）
A. Command
B. Transfer object
C. Service locator
D. Session Façade
E. Business delegate
F. Data access object -
多项选择题
Whichthe twoarecharacteristicsoftheServiceLocatorpattern？（）
A. It encapsulates component lookup procedures
B. It increases source code duplication and decreases reuse
C. It improves client performance by caching context and factory objects
D. It degrades network performance due to increased access to distributed lookup services
