Ikk：新頁面: 10. public class Pizza{ 11. ArrayList toppings; 12. 13. public final void addTopping(String topping){ 14. toppings.add(topping); 15. } 16. 17. public void removeTop...

2013-03-30T07:34:03Z

新頁面: 10. public class Pizza{ 11. ArrayList toppings; 12. 13. public final void addTopping(String topping){ 14. toppings.add(topping); 15. } 16. 17. public void removeTop...

新頁面

10. public class Pizza{
11. ArrayList toppings;
12.
13. public final void addTopping(String topping){
14. toppings.add(topping);
15. }
16.
17. public void removeTopping(String topping){
18. toppings.remove(topping);
19. }
20. }
And:
30. class PepperoniPizza extends Pizza{
31. public void addTopping(String topping){
32. System.out.println("Cannot add Toppings");
33. }
34.
35. public void removeTopping(String topping){
36. System.out.println("Cannot remove pepperoni");
37. }
38. }
And:
50. Pizza pizza = new PepperoniPizza();
51. pizza.addTopping("Mushrooms");
52. pizza.removeTopping("Pepperoni");

What is the result?
A. Compilation fails.
B. Cannot add Toppings
C. The code runs with no output.
D. A NullPointerException is thrown in Line 4.

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

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

<span style="font-size:medium;"> 解說:
第13行，public final void addTopping，方法宣告成final表示子類別不能對這個方法進行覆載(overriding)

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 046 - 修訂歷史

Ikk：新頁面: 10. public class Pizza{ 11. ArrayList toppings; 12. 13. public final void addTopping(String topping){ 14. toppings.add(topping); 15. } 16. 17. public void removeTop...