Whichtwo choicesareequivalent？（）

A.AnexceptionisthrownatruntimebySourceServlet.

B.AnexceptionisthrownatruntimebyDestinationServlet.

C.Only"hellofromdest"appearsintheresponseoutputstream.

D.Both"hellofromsource"and"hellofromdest"appearintheresponseoutputstream.

ossmultiplerequestsfromthatuser，fromthesamebrowserinstance.Whichtwoprovidethiscapability fromwithinataghandler？（）

A.pageContext.setAttribute（"name"，theValue）

B.pageContext.setAttribute（"name"，getSession（））

C.pageContext.getRequest（）.setAttribute（"name"，theValue）

D.pageContext.getSession（）.setAttribute（"name"，theValue）

E.pageContext.setAttribute（"name"，theValue，PageContext.PAGE_SCOPE）

F.pageContext.setAttribute（"name"，theValue，PageContext.SESSION_SCOPE）

ce（HttpServletRequestrequest，13.HttpServletResponseresponse）14.throwsServletException，IOException{15.HttpSessionsession=request.getSession（）；16.session.setAttribute（"myAttribute"，"myAttributeValue"）；17.session.invalidate（）；18.response.getWriter（）.println（"value="+19.session.getAttribute（"myAttribute"））；20.}21.}WhatistheresultwhenarequestissenttoMyServlet？（）

A.AnIllegalStateExceptionisthrownatruntime.

B.AnInvalidSessionExceptionisthrownatruntime.

C.Thestring"value=null"appearsintheresponsestream.

D.Thestring"value=myAttributeValue"appearsintheresponsestream.

A.longcustomerOID=47L；session.setAttribute（"customerOID"，newLong（customerOID））；

B.longcustomerOID=47L；session.setLongAttribute（"customerOID"，newLong（customerOID））；

C.longcustomerOID=47L；session.setAttribute（"customerOID"，customerOID）；

D.longcustomerOID=47L；session.setNumericAttribute（"customerOID"，newLong（customerOID））；

.AbugreporthascomeinthatindicatesthatanimportantsessionattributeisbeingdeletedtoosoonandaNullPointerExceptionisbeingthrownseveralinteractionsafterthefact.Youhavedecidedtocreateasessioneventlistenerthatwilllogwhenattributesarebeingdeletedsoyoucantrackdownwhentheattributeiserroneouslybeingdeleted.Whichlistenerclasswillaccomplishthisdebugginggoal？（）

A.CreateanHttpSessionAttributeListenerclassandimplementtheattributeDeletedmethodandlogthe attributenameusingthegetNamemethodontheeventobject.

B.CreateanHttpSessionAttributeListenerclassandimplementtheattributeRemovedmethodandlogthe attributenameusingthegetNamemethodontheeventobject.

C.CreateanSessionAttributeListenerclassandimplementtheattributeRemovedmethodandlogthe attributenameusingthegetAttributeNamemethodontheeventobject.

D.CreateanSessionAttributeListenerclassandimplementtheattributeDeletedmethodandlogthe attributenameusingthegetAttributeNamemethodontheeventobject.

A.privatevoidsetVar（inta，floatc，intb）{}

B.protectedvoidsetVar（inta，intb，floatc）{}

C.publicintsetVar（inta，floatc，intb）{returna：}

D.publicintsetVar（inta，intb，floatc）{returna：}

E.protectedfloatsetVar（inta，intb，floatc）{returnc：}

1.classA{3.publicStringtoString（）{4.return4”；5.}6.}7.classBextendsA{8.publicStringtoString（）{9.returnsuper.toString（）+3”；10.}11.}12.publicclassTest{13.publicstaticvoidmain（String[]args）{14.System.out.printIn（newB（））；15.}16.}Whatistheresult()？

A.Compilationsucceedsand4isprinted.

B.Compilation……………isprinted.

C.Anerroronline9causecompilationtofail.

D.Anerroronline14causecompilationtofail.

E.Compilationsucceedsbutanexceptionisthrownatline9.

A.Accesstosession-scopedattributesisguaranteedtobethread-safebythewebcontainer.

B.ToactivateURLrewriting，thedevelopermustusetheHttpServletResponse.setURLRewritingmethod.

C.IfthewebapplicationusesHTTPS，thenthewebcontainermayusethedataontheHTTPSrequest streamtoidentifytheclient.

D.TheJSESSIONIDcookieisstoredpermanentlyontheclientsothatausermayreturntotheweb applicationandthewebcontainerwillrejointhatsession.

youwanttoclearoutthissetofattributesfromthesessionobject.Assumethatthisstaticvariableholdsthissetofattributenames：201.privatestaticfinalSet<String>USE_CASE_ATTRS；202.static{203.USE_CASE_ATTRS.add（"customerOID"）；204.USE_CASE_ATTRS.add（"custMgrBean"）；205.USE_CASE_ATTRS.add（"orderOID"）；206.USE_CASE_ATTRS.add（"orderMgrBean"）；207.}Whichcodesnippetdeletestheseattributesfromthesessionobject？（）

A.session.removeAll（USE_CASE_ATTRS）；

B.for（Stringattr：USE_CASE_ATTRS）{session.remove（attr）；}

C.for（Stringattr：USE_CASE_ATTRS）{session.removeAttribute（attr）；}

D.for（Stringattr：USE_CASE_ATTRS）{session.deleteAttribute（attr）；}

E.session.deleteAllAttributes（USE_CASE_ATTRS）；

1.classA{2.publicbytefileNumber(){3.returnl;4.}5.}6.7.ClassBextendsA{8.publicshortgetNumber(){9.return2;10.}11.12.publicshortgetNumber(){13.Bb=newB();14.System.out.printIn(b.getNumber());15.}16.}Whatistheresult（）?

A.Compilationsucceedsandlisprinted.

B.Compilationsucceedsand2printed.

C.Anerroratline8causecompilationtofail.

D.Anerroratline14causecomplicationtofail.

E.Complicationsucceedsbutanexceptionisthrownatline14.