SCJP題庫第188題
Given a pre-generics implementation of a method:
11. public static int sum(List list){
12. int sum = 0;
13. for(Iterator iter = list.iterator(); iter.hasNext();){
14. int i = ((Integer)iter.next()).intValue();
15. sum += i;
16. }
17. return sum;
18. }
What three changes allow the class to be used with generics and avoid an unchecked warning? (Choose three.)
A. Remove line 14.
B. Replace line 14 with "int i = iter.next();".
C. Replace line 13 with "for(int i : intList){".
D. Replace line 13 with "for(Iterator iter : intList){".
E. Replace the method declaration with "sum(List<int> intList)".
F. Replace the method declaration with "sum(List<Integer> intList)".
Ans: ACF
解說:
那三項改變可以使用這個類別以泛型的方式來使用，並且可以避免unchecked 的警告？
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