QUESTION 28

QUESTION 28 
Click the Exhibit button. 
 
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 
F. change line 3 in the MeGo class to super.wheelCount = 3; 
Solution : DE

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plus imformation 

wheelCount는 class_car에서 private으로 선언되어 있다 .

그렇기 때문에 Mego 에서 wheelCount 변수를 사용하기 위해서는 Super(vin)선언 or wheelCount 접근 제한자를 체인지 .