Ikk：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...

2013-03-30T05:44:18Z

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...

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 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.

<div class="toccolours mw-collapsible mw-collapsed">
<span style="font-size:medium;">解答</span>

----
<div class="mw-collapsible-content">
<span style="font-size: medium;">Ans: E </span>

<span style="font-size:medium;"> 解說:
Super只能用來存取物件成員
22行須改為
int c = SuperCalc.multiply(a, b);

</span>
</div></div>
{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 100 - 修訂歷史

Ikk：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...