試題詳解

 1. interface DoStuff2{ 

2. float getRange(int low, int high)；} 

 3.

 4. interface DoMore {

 5. float getAvg(int a, int b, int c)；} 

6. 

7. abstract class DoAbstract implements DoStuff2, DoMore{} 

8.

 9. class DoStuff implements DoStuff2{ 

10. public float getRange(int x, int y){return 3.14f；}} 

11. 

12. interface DoAll extends DoMore{ 

13. float getAvg(int a, int b, int c, int d)；} 

What is the result?
(A) The file will compile without error.
(B) Compilation fails. Only line 7 contains an error.
(C) Compilation fails. Only line 12 contains an error.
(D) Compilation fails. Only line 13 contains an error.
(E) Compilation fails. Only lines 7 and 12 contain errors. F. Compilation fails. Only lines 7 and 13 contain errors. G. Compilation fails. Lines 7, 12, and 13 contain errors.