"SCJP 1.6版考題 100" 修訂間的差異
出自 陳富國維基館
(新頁面: 10. public class SuperCalc{ 11. protected static int multiply(int a, int b){return a * b;} 12. } and: 20. public class SubCalc extends SuperCalc{ 21. public static int multip...) |
(無差異)
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於 2013年3月30日 (六) 05:44 的最新修訂
10. public class SuperCalc{
11. protected static int multiply(int a, int b){return a * b;}
12. }
and:
20. public class SubCalc extends SuperCalc{
21. public static int multiply(int a, int b){
22. int c = super.multiply(a, b);
23. return c;
24. }
25.}
and:
30. SubCalc sc = new SubCalc();
31. System.out.println(sc.multiply(3, 4));
32. System.out.println(SubCalc.multiply(2, 2));
What is the result?
A. 12 4
B. The code runs with no output.
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 21.
E. Compilation fails because of an error in line 22.
F. Compilation fails because of an error in line 31.
解答
Ans: E
解說:
Super只能用來存取物件成員 22行須改為 int c = SuperCalc.multiply(a, b);
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