Whichthe twodemonstrateencapsulationofdata？（）

A.WARfilesmustbelocatedinthewebapplicationlibrarydirectory.

B.WARfilesmustcontainthewebapplicationdeploymentdescriptor.

C.WARfilesmustbecreatedbyusingarchivetoolstodesignedspecificallyforthatpurpose.

D.ThewebcontainermustservethecontentofanyMETA-INFdirectorylocatedinaWARfile.

E.ThewebcontainermustallowaccesstoresourcesinJARsinthewebapplicationlibrarydirectory

A.Accesstosession-scopedattributesisguaranteedtobethread-safebythewebcontainer.

B.ToactivateURLrewriting，thedevelopermustusetheHttpServletResponse.setURLRewritingmethod.

C.IfthewebapplicationusesHTTPS，thenthewebcontainermayusethedataontheHTTPSrequeststreamtoidentifytheclient.

D.TheJSESSIONIDcookieisstoredpermanentlyontheclientsothatausermayreturntothewebapplicationandthewebcontainerwillrejointhatsession.

A.HTTPBasicAuthentication

B.FormBasedAuthentication

C.HTTPDigestAuthentication

D.HTTPSClientAuthentication

A.

B.

C.

D.

E.

A.Awebapplicationmayoverridethewebcontainer’simplementationclasses

B.AwebapplicationrunninginaJ2EEproductmayoverrideclassesinthejavax.*namespace

C.AwebapplicationclassloadermayNOToverrideanyclassesinthejava.*andjavax.*namespace

D.ResourcesintheWARclassdirectoryorinanyoftheJARfileswithinthelibrarydirectorymaybeaccessedusingtheJ2SEsemanticsofgetResource

E.ResourcesintheWARclassdirectoryorinanyoftheJARfileswithinthelibrarydirectorycannotbeaccessedusingtheJ2SEsemanticsofgetResource

A.Itencapsulatescomponentlookupprocedures

B.Itincreasessourcecodeduplicationanddecreasesreuse

C.Itimprovesclientperformancebycachingcontextandfactoryobjects

D.Itdegradesnetworkperformanceduetoincreasedaccesstodistributedlookupservices

A.floatfoo=-1；

B.floatfoo=1.0；

C.floatfoo=42el：

D.floatfoo=2.02f：

E.floatfoo=3.03d：

A.authorization

B.dataintegrity

C.confidentiality

D.authentication

A.3/2

B.3＜2

C.3*4

D.3＜＜2

E.3*22

F.3＜＜＜2

A.HttpSessionListener

B.HttpSessionBindingListener

C.HttpSessionTimedOutListener

D.HttpSessionAttributeListener

E.HttpSessionActivationListener

F.HttpSessionPassivatedListener