多項(xiàng)選擇題Which two are valid and equivalent?()

A.<%! int i; %>
B.<%= int i; %>
C.<jsp:expr>int i;</jsp:expr>
D.<jsp:scriptlet>int i;</jsp:scriptlet>
E.<jsp:declaration>int i;</jsp:declaration>


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2.多項(xiàng)選擇題Given that a scoped attribute cart exists only in a user’s session, which two,taken independently,ensurethe scoped attribute cart no longer exists?()

A.${cart = null}
B.<c:remove var="cart" />
C.<c:remove var="${cart}" />
D.<c:remove var="cart" scope="session" />
E.<c:remove scope="session">cart</c:remove>

3.多項(xiàng)選擇題

Given in a single JSP page:
<%@ taglib prefix=’java’ uri=’myTags’ %>
<%@ taglib prefix=’JAVA’ uri=’moreTags’ %> 
Which two are true?()

A.The prefix ’java’ is reserved.
B.The URI ’myTags’ must be properly mapped to a TLD file by the web container.
C.A translation error occurs because the prefix is considered identical by the web container.
D.For the tag usage , the tag1 must be unique in the union of tag names in ’myTags’ and’moreTags’.

4.單項(xiàng)選擇題Which interface must a session attribute implement if it needs to be notified when a web container persistsa session?()

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

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