classSuper{2.publicfloatgetNum(){return3.0f;}3.}4.5.publicclassSubextendsSuper{6.7.}Whichmethod,placedatline6,causescompilationtofail?() A.publicvoidgetNum（）{}B.publicvoidgetNum（doubled）{}C.publicfloatgetNum（）{return4.0f；}D.publicdoublegetNum（floatd）{return4.0d；}
classSuper{2.publicfloatgetNum(){return3.0f;}3.}4.5.publicclassSubextendsSuper{6.7.}Whichmethod,placedatline6,causescompilationtofail?()
A.publicvoidgetNum（）{}
B.publicvoidgetNum（doubled）{}
C.publicfloatgetNum（）{return4.0f；}
D.publicdoublegetNum（floatd）{return4.0d；}
相关考题：
1.classA{2.publicintgetNumber（inta）{3.returna+1；4.}5.}6.7.classBextendsA{8.publicintgetNumber（inta）{9.returna+210.}11.12.publicstaticvoidmain（Stringargs[]）{13.Aa=newB（）；14.System.out.printIn（a.getNumber（0））；15.}16.}Whatistheresult？（）A.Compilationsucceedsand1isprinted.B.Compilationsucceedsand2isprinted.C.Anerroratline8causescompilationtofail.D.Anerroratline13causescompilationtofail.E.Anerroratline14causescompilationtofail.
classsuper{2.publicfloatgetNum(){return3.0f;}3.}4.5.publicclassSubextendsSuper{6.7.}Whichmethod,placedatline6,willcauseacompilererror?() A.PublicfloatgetNum（）{return4.0f；}B.PublicvoidgetNum（）{}C.PublicvoidgetNum（doubled）{}D.PublicdoublegetNum（floatd）{retrun4.0f；}
abstractclassabstrctIt{abstractfloatgetFloat();}publicclassAbstractTestextendsAbstractIt{privatefloatf1=1.0f;privatefloatgetFloat(){returnf1;}}Whatistheresult?() A.Compilationissuccessful.B.Anerroronline6causesaruntimefailure.C.Anerroratline6causescompilationtofail.D.Anerroratline2causescompilationtofail.
interfacefoo{2.intk=0;3.}4.5.publicclasstestimplementsFoo(6.publicstaticvoidmain(Stringargs[])(7.inti;8.Testtest=newtest();9.i=test.k;10.i=Test.k;11.i=Foo.k;12.)13.)14.Whatistheresult?() A.Compilationsucceeds.B.Anerroratline2causescompilationtofail.C.Anerroratline9causescompilationtofail.D.Anerroratline10causescompilationtofail.E.Anerroratline11causescompilationtofail.
publicclasstest(2.publicstaticvoidmain(Stringargs[]){3.inti=0xFFFFFFF1;4.intj=~i;5.6.}7.)Whatisthedecimalvalueofjatline5?() A.0B.1C.14D.–15E.Anerroratline3causescompilationtofail.F.Anerroratline4causescompilationtofail.
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.
publicclassX{publicstaticvoidmain(Stringargs){inta=newint[1]modify(a);System.out.printIn(a[0]);}publicstaticvoidmodify(inta){a[0]＋＋;}}Whatistheresult?() A.Theprogramrunsandprints“0”B.Theprogramrunsandprints“1”C.Theprogramrunsbutabortswithanexception.D.Anerror“possibleundefinedvariable”atline4causescompilationtofail.E.Anerror“possibleundefinedvariable”atline9causescompilationtofail.
classA{publicintgetNumber(inta){returna＋1;}}classBextendsA{publicintgetNumber(inta){returna＋2}publicstaticvoidmain(Stringargs){Aa=newB();System.out.printIn(a.getNumber(0));}}Whatistheresult?() A.Compilationsucceedsand1isprinted.B.Compilationsucceedsand2isprinted.C.Anerroratline8causescompilationtofail.D.Anerroratline13causescompilationtofail.E.Anerroratline14causescompilationtofail.
classsuper{publicfloatgetNum(){return3.0f;}}publicclassSubextendsSuper{}Whichmethod,placedatline6,willcauseacompilererror?() A.PublicfloatgetNum（）{return4.0f；}B.PublicvoidgetNum（）{}C.PublicvoidgetNum（doubled）{}D.PublicdoublegetNum（floatd）{retrun4.0f；}