问答题

publicclassCar{privateintwheelCount；privateStringvin；publicCar（Stringvin）{this.vin=vin；this.wheelCount=4；}publicStringdrive（）{returnzoom-zoom”；}publicStringgetInfo（）{returnVIN：+vin+wheels：+wheelCount；}}And：publicclassMeGoextendsCar{publicMeGo（Stringvin）{this.wheelCount=3；}}Whattwomusttheprogrammerdotocorrectthecompilationerrors？（）
A.insertacalltothis（）intheCarconstructor
B.insertacalltothis（）intheMeGoconstructor
C.insertacalltosuper（）intheMeGoconstructor
D.insertacalltosuper（vin）intheMeGoconstructor
E.changethewheelCountvariableinCartoprotected
F.changeline3intheMeGoclasstosuper.wheelCount=3；

A.vin=vin；this.wheelCount=4；}publicStringdrive（）{returnzoom-zoom”；}publicStringgetInfo（）{returnVIN：+vin+wheels：+wheelCount；}}And：publicclassMeGoextendsCar{publicMeGo（Stringvin）{this.wheelCount=3；}}Whattwomusttheprogrammerdotocorrectthecompilationerrors？（）
A.insertacalltothis（）intheCarconstructor
B.insertacalltothis（）intheMeGoconstructor
C.insertacalltosuper（）intheMeGoconstructor
D.insertacalltosuper（vin）intheMeGoconstructor
E.changethewheelCountvariableinCartoprotected
F.changeline3intheMeGoclasstosuper.wheelCount=3；

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Whichtwoaretrueabouthas－aandis－arelationships？（）

A.Inheritancerepresentsanis-arelationship.
B.Inheritancerepresentsahas-arelationship.
C.Interfacesmustbeusedwhencreatingahas-arelationship.
D.Instancevariablescanbeusedwhencreatingahas-arelationship.

问答题

10.interfaceJumper{publicvoidjump（）；}......20.classAnimal{}......30.classDogextendsAnimal{31.Tailtail；32.}......40.classBeagleextendsDogimplementsJumper{41.publicvoidjump（）{}42.}.......50.classCatimplementsJumper{51.publicvoidjump（）{}52.}Whichthreearetrue？（）
A.Catis-aAnimal
B.Catis-aJumper
C.Dogis-aAnimal
D.Dogis-aJumper
E.Cathas-aAnimal
F.Beaglehas-aTail
G.Beaglehas-aJumper

A.interfaceJumper{publicvoidjump（）；}......20.classAnimal{}......30.classDogextendsAnimal{31.Tailtail；32.}......40.classBeagleextendsDogimplementsJumper{41.publicvoidjump（）{}42.}.......50.classCatimplementsJumper{51.publicvoidjump（）{}52.}Whichthreearetrue？（）
A.Catis-aAnimal
B.Catis-aJumper
C.Dogis-aAnimal
D.Dogis-aJumper
E.Cathas-aAnimal
F.Beaglehas-aTail
G.Beaglehas-aJumper