对于以下类:classa{}classbextendsa{}classcextendsa{}publicclasstest{publicstaticvoidmain(stringargs[]){ax=newa();by=newb();cz=newc();／／此处插入一条语句}}下面哪个语句可以放在插入行_________。 A.y=(A)y;B.z=x;C.x=y;D.z=(C)y;
对于以下类:classa{}classbextendsa{}classcextendsa{}publicclasstest{publicstaticvoidmain(stringargs[]){ax=newa();by=newb();cz=newc();／／此处插入一条语句}}下面哪个语句可以放在插入行_________。
A.y=(A)y;
B.z=x;
C.x=y;
D.z=(C)y;
相关考题：
已知类的继承关系如下:classAclassBextendsAclassCextendsA则以下语句能通过编译的是()。 A.Cc=newB()B.Cc=newA()C.Aa=newB()D.Bb=newC()
Whichstatements，wheninsertedattheindicatedpositioninthefollowingcode，willcausearuntimeexceptionwhenattemptingtoruntheprogram？（）classA{}classBextendsA{}classCextendsA{}publicclassQ3ae4{publicstaticvoidmain（Stringargs[]）{Ax=newA（）；By=newB（）；Cz=newC（）；//insertstatementhere}}A.x=y；B.z=x；C.y=（B）x；D.z=（C）y；E.y=（A）y；
classA{publicA（）{System.out.println（hellofroma”）；}}classBextendsA{publicB（）{System.out.println（hellofromb”）；super（）；}}publicclassTest{publicstaticvoidmain（Stringargs[]）{Aa=newB（）；}}Whatistheresultwhenmainisexecuted？（）A.Compilationfails.B.hellofromaC.hellofrombD.hellofrombhellofromaE.hellofromahellofromb
classA{publicbytegetNumber(){return1;}}classBextendsA{publicshortgetNumber(){return2;}publicstaticvoidmain(Stringargs[]){Bb=newB();System.out.println(b.getNumber());}}Whatistheresult?() A.1B.2C.Anexceptionisthrownatruntime.D.Compilationfailsbecauseofanerrorinline8.E.Compilationfailsbecauseofanerrorinline14.
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.
classA{publicbytegetNumber(){return1;}}classBextendsA{publicshortgetNumber(){return2;}publicstaticvoidmain(Stringargs){Bb=newB();System.out.printIn(b.getNumber())}}Whatistheresult?() A.Compilationsucceedsand1isprinted.B.Compilationsucceedsand2isprinted.C.Anerroratline8causescompilationtofail.D.Anerroratline14causescompilationtofail.E.Compilationsucceedsbutanexceptionisthrownatline14.
4、已知类的继承关系如下： class A class B extends A class C extends A 则以下语句中能够通过编译的是？A．A a=new B();B．C c=new B();C．C c=new A();D．B b=new C();
1.已知类的继承关系如下： class A class B extends A class C extends A 则以下语句能通过编译的是（） A: A a=new B（); B: C c=new B（); C: C c=new A（); D: B b=new C（);A．A B C DB．A B C DC．A B C DD．A B C D