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SCJP 1.6版考題 021 - 修訂歷史
2026-05-23T15:01:53Z
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Ikk：新頁面: 1. class Batman{ 2. int squares = 81; 3. public static void main(String[] args){ 4. new Batman().go(); 5. } 6. void go(){ 7. incr(++squares); 8. System.out....
2013-03-30T08:32:38Z
<p>新頁面: 1. class Batman{ 2. int squares = 81; 3. public static void main(String[] args){ 4. new Batman().go(); 5. } 6. void go(){ 7. incr(++squares); 8. System.out....</p>
<p><b>新頁面</b></p><div> 1. class Batman{<br />
2. int squares = 81;<br />
3. public static void main(String[] args){<br />
4. new Batman().go();<br />
5. }<br />
6. void go(){<br />
7. incr(++squares);<br />
8. System.out.println(squares);<br />
9. }<br />
10. void incr(int squares){squares += 10;}<br />
11. }<br />
<br />
<br />
What is the result?<br />
<br />
A. 81<br />
B. 82<br />
C. 91<br />
D. 92<br />
E. Compilation fails.<br />
F. 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 />
----<br />
<div class="mw-collapsible-content"><br />
<span style="font-size: medium;">Ans: B </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
go方法印出的squares是Batman的squares，incr所變更的squares是本身的方法變數<br />
此是在考call by value觀念<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk