Ikk：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 ...

2013-03-30T07:55:53Z

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 ...

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
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;}

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

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

<span style="font-size:medium;"> 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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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 038 - 修訂歷史

Ikk：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 ...