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单项选择题 34. HashMap props = new HashMap();  35. props.put(”key45”, “some value”);  36. props.put(”key12”, “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);

  • B
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