Ikk：新頁面: 10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } ...

2013-03-30T06:55:03Z

新頁面: 10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } ...

新頁面

10. abstract public class Employee {
11. protected abstract double getSalesAmount();
12. public double getCommision() {
13. return getSalesAmount() * 0.15;
14. }
15. }
16. class Sales extends Employee {
17. //insert method here
18. }

Which two methods, inserted independently at line 17, correctly complete the Sales class? (Choose two.)
A. double getSalesAmount() { return 1230.45; }
B. public double getSalesAmount() { return 1230.45; }
C. private double getSalesAmount() { return 1230.45; }
D. protected double getSalesAmount() { return 1230.45; }

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<span style="font-size:medium;">解答</span>

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<span style="font-size: medium;">Ans: B D </span>

<span style="font-size:medium;"> 解說:
Overridding規則
A/C錯是因為其存取屬性的開放性皆小於protected!

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 067 - 修訂歷史

Ikk：新頁面: 10. abstract public class Employee { 11. protected abstract double getSalesAmount(); 12. public double getCommision() { 13. return getSalesAmount() * 0.15; 14. } 15. } ...