单项选择题

classA{publicStringtoString（）{return4”；}}classBextendsA{8.publicStringtoString（）{returnsuper.toString（）+3”；}}publicclassTest{publicstaticvoidmain（Stringargs）{System.out.printIn（newB（））；}}Whatistheresult？（）
A.Compilationsucceedsand4isprinted.
B.Compilationsucceedsand43isprinted.
C.Anerroronline9causescompilationtofail.
D.Anerroronline14causescompilationtofail.
E.Compilationsucceedsbutanexceptionisthrownatline9.

A.publicStringtoString（）{returnsuper.toString（）+3”；}}publicclassTest{publicstaticvoidmain（Stringargs）{System.out.printIn（newB（））；}}Whatistheresult？（）
A.Compilationsucceedsand4isprinted.
B.Compilationsucceedsand43isprinted.
C.Anerroronline9causescompilationtofail.
D.Anerroronline14causescompilationtofail.
E.Compilationsucceedsbutanexceptionisthrownatline9.

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问答题

YouarecreatingaWindowsFormsapplicationbyusingthe.NETFramework3.5.TheapplicationdisplaysemployeenamesbyusingtheTreeViewcontrol.YouneedtoimplementthedraganddropfunctionalityintheTreeViewcontrol.Whichtwoactionsshouldyouperform？（）
A.SettheAllowDragpropertytotrue.CreateaneventhandlerfortheDragOverevent.
B.SettheAllowDragpropertytotrue.CreateaneventhandlerfortheItemDrageventtocalltheDoDragDropmethod.
C.SettheAllowDragpropertytotrue.CreateaneventhandlerfortheDragEntereventtocalltheDoDragDropmethod.
D.CreateaneventhandlerfortheDragDropeventtohandlethemoveorcopybyitself.
E.CreateaneventhandlerfortheDragEntereventtohandlethemoveorcopybyitself.

A.NETFramework3.5.TheapplicationdisplaysemployeenamesbyusingtheTreeViewcontrol.YouneedtoimplementthedraganddropfunctionalityintheTreeViewcontrol.Whichtwoactionsshouldyouperform？（）
A.SettheAllowDragpropertytotrue.CreateaneventhandlerfortheDragOverevent.
B.SettheAllowDragpropertytotrue.CreateaneventhandlerfortheItemDrageventtocalltheDoDragDropmethod.
C.SettheAllowDragpropertytotrue.CreateaneventhandlerfortheDragEntereventtocalltheDoDragDropmethod.
D.CreateaneventhandlerfortheDragDropeventtohandlethemoveorcopybyitself.
E.CreateaneventhandlerfortheDragEntereventtohandlethemoveorcopybyitself.

问答题

YoudiscoverthataparticulargroupofsettingsnamedUserPreferenceschanges.YouneedtostoretheUserPreferencesettingstopreventaffectingotherapplications.Whichtwoactionsshouldyouperform？（）

A.UsetheProperties.USerPreferencesobject
B.UsetheProperties.Settings.Default.Userprefencesobject
C.UsetheConfigurationManager.AppSettingsobjectduringruntime
D.CreatethesettingsbyusingApplicationscope
E.CreatethesettingsbyusingUserscope