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SCJP 1.6版考題 130 - 修訂歷史
2026-04-24T03:06:20Z
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Ikk：新頁面: Given: 11. static void test(){ 12. try{ 13. String x = null; 14. System.out.print(x.toString() + " "); 15. } 16. finally{System.out.print("finally ");} 17. } 1...
2013-03-30T03:47:19Z
<p>新頁面: Given: 11. static void test(){ 12. try{ 13. String x = null; 14. System.out.print(x.toString() + " "); 15. } 16. finally{System.out.print("finally ");} 17. } 1...</p>
<p><b>新頁面</b></p><div> Given:<br />
11. static void test(){<br />
12. try{<br />
13. String x = null;<br />
14. System.out.print(x.toString() + " ");<br />
15. }<br />
16. finally{System.out.print("finally ");}<br />
17. }<br />
18. public static void main(String[] args){<br />
19. try{test();}<br />
20. catch(Exception ex){System.out.print("exception ");}<br />
21. }<br />
<br />
<br />
What is the result?<br />
A. null<br />
B. finally<br />
C. null finally<br />
D. Compilation fails.<br />
E. finally exception<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: E </span><br />
<br />
<span style="font-size:medium;"> 解說:<br />
14行x.toString()錯誤，因為x是null，不能用null去操作一個不存在的物件方法toString<br />
執行finally內的敘述之後，丟出nullPointerException例外回到main…<br />
由20行的catch補捉此例外…<br />
</span> <br />
</div></div><br />
{{SCJP 1.6版考題講解}}</div>
Ikk