Ikk：新頁面: Given classes defined in two different files: 1. package packageA; 2. public class Message{ 3. String getText(){return "text";} 4. } And: 1. package packageB; 2. public class...

2013-03-30T06:13:22Z

新頁面: Given classes defined in two different files: 1. package packageA; 2. public class Message{ 3. String getText(){return "text";} 4. } And: 1. package packageB; 2. public class...

新頁面

Given classes defined in two different files:
1. package packageA;
2. public class Message{
3. String getText(){return "text";}
4. }
And:
1. package packageB;
2. public class XMLMessage extends packageA.Message{
3. String getText(){return "<msg>text</msg>";}
4. public static void main(String[] args) {
5. System.out.println(new XMLMessage().getText());
6. }
7. }

What is the result of executing XMLMessage.main?
A. text
B. Compilation fails.
C. <msg>text</msg>
D. An exception is thrown at runtime.

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

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

<span style="font-size:medium;"> 解說:
此題new XMLMessage().getText()是以XMLMessage類別中的getText方法(物件是什麼型態就是那個型態的方法)

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{{SCJP 1.6版考題講解}}

SCJP 1.6版考題 079 - 修訂歷史

Ikk：新頁面: Given classes defined in two different files: 1. package packageA; 2. public class Message{ 3. String getText(){return "text";} 4. } And: 1. package packageB; 2. public class...