[問題] 關於SCJP 第77題的疑問

[sheep922420 ()]

Given:
11. public static void main(String[] args) {
12. Object obj = new int{1, 2, 3};
13. int[] someArray = (int[])obj;
14. for (int i: someArray) System.out.print(i + " ");
15. }

What is the result?
A. 1 2 3
B. Compilation fails because of an error in line 12.
C. Compilation fails because of an error in line 13.
D. Compilation fails because of an error in line 14.
E. A ClassCastException is thrown at runtime.

答案：A


我的疑點在第13行,

任何物件都是繼承 Object物件

obj宣告的類型為 Object

要把Object 向下轉型成 int[] 類型, 應該會產生 ClassCastException

可是卻編譯成功??

想請問版上高手我錯誤的點是在哪邊??

謝謝!!!

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◆ From: 111.254.105.196
→ realmeat:實體是new的那個 Object只是接起來
推 PsMonkey:你只是把他當成 Object，他骨子裡還是 int[]
→ sheep922420:感謝樓上兩位大大!!!
→ DeathWatch:多型
推 Hankmix:我第12行要打Object obj = new int[]{1, 2, 3}; 才會過耶
→ Hankmix:不然那行會出錯耶
→ Hankmix:像這樣http://ppt.cc/RNDW
推 PsMonkey:XD 應該是原 po 的 typo，你是對的 XDDD