"SCJP 1.6版考題 038" 修訂間的差異
出自 陳富國維基館
(新頁面: 1. class One{ 2. public One foo(){return this;} 3. } 4. class Two extends One{ 5. public One foo(){return this;} 6. } 7. class Three extends Two{ 8. //insert method here ...) |
(無差異)
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於 2013年3月30日 (六) 07:55 的最新修訂
1. class One{
2. public One foo(){return this;}
3. }
4. class Two extends One{
5. public One foo(){return this;}
6. }
7. class Three extends Two{
8. //insert method here
9. }
Which two methods, inserted individually, correctly complete the Three class? (Choose two.)
A. public void foo(){}
B. public int foo(){return 3;}
C. public Two foo(){return this;}
D. public One foo(){return this;}
E. public Object foo(){return this;}
解答
Ans: C D
解說:
overriding 比較要注意的是C為何可以，是因為Two is One(繼承關係)
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