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SCJP 1.6版考題 090 - 修訂歷史
2026-04-16T21:35:42Z
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Ikk：新頁面: 11. interface DeclareStuff{ 12. public static final int EASY = 3; 13. void doStuff(int t);} 14. public class TestDeclare implements DeclareStuff{ 15. public static void ma...
2013-03-30T05:58:36Z
<p>新頁面: 11. interface DeclareStuff{ 12. public static final int EASY = 3; 13. void doStuff(int t);} 14. public class TestDeclare implements DeclareStuff{ 15. public static void ma...</p>
<p><b>新頁面</b></p><div> 11. interface DeclareStuff{<br />
12. public static final int EASY = 3;<br />
13. void doStuff(int t);}<br />
14. public class TestDeclare implements DeclareStuff{<br />
15. public static void main(String[] args){<br />
16. int x = 5;<br />
17. new TestDeclare().doStuff(++x);<br />
18. }<br />
19. void doStuff(int s){<br />
20. s += EASY + ++s;<br />
21. System.out.println("s " + s);<br />
22. }<br />
23. }<br />
<br />
<br />
What is the result?<br />
A. s 14<br />
B. s 16<br />
C. s 10<br />
D. Compilation fails.<br />
E. An exception is thrown at runtime.<br />
<br />
<div class="toccolours mw-collapsible mw-collapsed"><br />
<span style="font-size:medium;">解答</span><br />
<br />
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<div class="mw-collapsible-content"><br />
<span style="font-size: medium;">Ans: D </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
在DeclareStuff介面中宣告的doStuff方法存取屬性是public(在介面的方法存取屬性是public的)<br />
TestDeclare要覆載doStuff方法，必須滿足overriding規則，19行需改為public void doStuff(int s)<br />
<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk