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.
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.
相关考题：
Whatproducesacompilererror?() A.classA{publicA（intx）{}}B.classA{}classBextendsA{B（）{}}C.classA{A（）{}}classB{publicB（）{}}D.classZ{publicZ（int）{}}classAextendsZ{}
InwhichtwocasesdoesthecompilersupplyadefaultconstructorforclassA?() A.classA{}B.classA{publicA（）{}}C.classA{publicA（intx）{}}D.classZ{}classAextendsZ{voidA（）{}}
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.
有如下模板声明：templatetypename T1，typename 12class A；下列声明中，与上述声明不等价的是A．templateclass T1，class T2class A；B．templateclass T1，typename T2class A；C．templatetypename TI，class T2class A；D．templatetypename T1，T2class A；
若有类A与类B，则以下哪个不属于类的组合关系A．class A { B b; };B．class A { B* p; };C．class A { B bb[3]; };D．class A { public: fun(B b); };