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SCJP 1.6版考題 037 - 修訂歷史
2026-04-13T11:42:14Z
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Ikk：新頁面: 21. abstract class C1{ 22. public C1(){System.out.print(1);} 23. } 24. class C2 extends C1{ 25. public C2(){System.out.print(2);} 26. } 27. class C3 extends C2{ 28. publi...
2013-03-30T07:57:25Z
<p>新頁面: 21. abstract class C1{ 22. public C1(){System.out.print(1);} 23. } 24. class C2 extends C1{ 25. public C2(){System.out.print(2);} 26. } 27. class C3 extends C2{ 28. publi...</p>
<p><b>新頁面</b></p><div> 21. abstract class C1{<br />
22. public C1(){System.out.print(1);}<br />
23. }<br />
24. class C2 extends C1{<br />
25. public C2(){System.out.print(2);}<br />
26. }<br />
27. class C3 extends C2{<br />
28. public C3(){System.out.print(3);}<br />
29. }<br />
30. public class Ctest{<br />
31. public static void main(String[] a){new C3();}<br />
32. }<br />
<br />
<br />
What is the result?<br />
<br />
A. 3<br />
B. 23<br />
C. 32<br />
D. 123<br />
E. 321 <br />
F. Compilation fails.<br />
G. An exception is thrown at runtime.<br />
<br />
<br />
<br />
<div class="toccolours mw-collapsible mw-collapsed"><br />
<span style="font-size:medium;">解答</span><br />
<br />
----<br />
<div class="mw-collapsible-content"><br />
<span style="font-size: medium;">Ans: D </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
當一個建構子中若沒有對本身建構子 (this)或父類別建構子(super)的呼叫，建構子會有一個隱含的super()，即對父類別建構子的呼叫，<br />
因此，在建立C3物件時會呼叫C3的建構子，C3建構子會先叫用C2的建構子…<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk