单项选择题

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.
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单项选择题

publicclassXimplementsRunnable(privateintx;privateinty;publicstaticvoidmain(Stringargs)(Xthat=newX();(newThread(that)).start();(newThread(that)).start();)publicsynchronizedvoidrun()(for(;;)(x++;y++;System.out.printIn(x=+x+,y=+y);)))Whatistheresult?()
A.Anerroratline11causescompilationtofail.
B.Errorsatlines7and8causecompilationtofail.
C.Theprogramprintspairsofvaluesforxandythatmightnotalwaysbethesameonthesameline(forexample,“x=2,y=1”)
D.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline(forexample,“x=1,y=1”.Inaddition,eachvalueappearstwice(forexample,“x=1,y=1”followedby“x=1,y=1”)
E.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline(forexample,“x=1,y=1”.Inaddition,eachvalueappearstwice(forexample,“x=1,y=1”followedby“x=2s,y=2”)

A.start();(newThread(that)).start();)publicsynchronizedvoidrun()(for(;;)(x++;y++;System.out.printIn(x=+x+,y=+y);)))Whatistheresult?()
A.Anerroratline11causescompilationtofail.
B.Errorsatlines7and8causecompilationtofail.
C.Theprogramprintspairsofvaluesforxandythatmightnotalwaysbethesameonthesameline(forexample,“x=2,y=1”)
D.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline(forexample,“x=1,y=1”.Inaddition,eachvalueappearstwice(forexample,“x=1,y=1”followedby“x=1,y=1”)
E.Theprogramprintspairsofvaluesforxandythatarealwaysthesameonthesameline(forexample,“x=1,y=1”.Inaddition,eachvalueappearstwice(forexample,“x=1,y=1”followedby“x=2s,y=2”)
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