"SCJP 1.6版考題 196" 修訂間的差異

於 2013年3月30日 (六) 00:17 的最新修訂

Given:
34. HashMap props = new HashMap();
35. props.put("key45", "some value");
36. props.put("keyl2", "some other value");
37. props.put("key39", "yet another value");
38. Set s = props.keySet();
39. //insert code here

What inserted at line 39, will sort the keys in the props HashMap?

 A. Arrays.sort(s);
 B. s = new TreeSet(s);
 C. Collections.sort(s);
 D. s = new SortedSet(s);