单项选择题

Oneoftheusecasesinyourwebapplicationusesmanysession-scopedattributes.Attheendoftheusecase，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）；

A.Attheendoftheusecase，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）；

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单项选择题

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.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.

单项选择题

1.classSuperFo{2.SuperFodoStuff（intx）{3.returnnewSuperFo（）4.}5.}6.7.classFooextendsSuperFo{8.//insertcodehere9.}和四个声明：FoodoStuff（intx）{returnnewFoo（）；}FoodoStuff（intx）{returnnewSuperFoo（）；}SuperFoodoStuff（intx）{returnnewfoo（）；}SuperFoodoStuff（inty）{returnnewSuperFoo（）；}分别插入到第8行，有几个可以通过编译（）
A.1
B.2
C.3
D.4
E.5

A.classSuperFo{2.SuperFodoStuff（intx）{3.returnnewSuperFo（）4.}5.}6.7.classFooextendsSuperFo{8.//insertcodehere9.}和四个声明：FoodoStuff（intx）{returnnewFoo（）；}FoodoStuff（intx）{returnnewSuperFoo（）；}SuperFoodoStuff（intx）{returnnewfoo（）；}SuperFoodoStuff（inty）{returnnewSuperFoo（）；}分别插入到第8行，有几个可以通过编译（）
A.1
B.2
C.3
D.4
E.5