SCJP 1.6版考題 067

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; }

解答

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Ans: B D

解說:

Overridding規則
A/C錯是因為其存取屬性的開放性皆小於protected!