第67題

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; }
答案：BD
參考：6-5 繼承、7-5 抽象類別
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實做的意思是要改寫一種...
A. double getSalesAmount() { return 1230.45; } //子類別存取修飾詞要大於父類別
C. private double getSalesAmount() { return 1230.45; } //子類別存取修飾詞要大於父類別