檢視 SCJP 1.6版考題 189 的原始碼

 23. Object[] myObjects = {
 24. new Integer(12),
 25. new String("foo"),
 26. new Integer(5),
 27. new Boolean(true)
 28. };
 29. Arrays.sort(myObjects);
 30. for(int i=0; i<myObjects.length; i++){
 31. System.out.print(myObjects[i].toString());
 32. System.out.print(" ");
 33. }
 
 What is the result?
  A. Compilation fails due to an error in line 23. 
  B. Compilation fails due to an error in line 29.
  C. A ClassCastException occurs in line 29.
  D. A ClassCastException occurs in line 31.
  E. The value of all four objects prints in natural order.

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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:
myObjects這個集合物件裏不同型態的物件，不同型態的物件排序時(需進行比較)會產生例外。(第29行)
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{{SCJP 1.6版考題講解}}