試題詳解

1. public class Car{

 2. private int wheelCount； 

3. private String vin； 

4. public Car(String vin){ 

5. this.vin = vin； 

6. this.wheelCount = 4； 

7. }

 8. public String drive(){

 9. return "zoom-zoom"； 

10. }

 11. public String getInfo(){ 

12. return "VIN: " + vin + "wheels: " + wheelCount； 

13. } 

14. } 

And:

 1. public class MeGo extends Car{

 2. public MeGo(String vin){ 

3. this.wheelCount = 3； 

4. }

 5. }

 What two must the programmer do to correct the compilation errors? (Choose two.)
(A) insert a call to this() in the Car constructor
(B) insert a call to this() in the MeGo constructor
(C) insert a call to super() in the MeGo constructor
(D) insert a call to super(vin) in the MeGo constructor
(E) change the wheelCount variable in Car to protected