Reverse Words in a String III

1class Solution {
2    public String reverseWords(String s) {
3        StringBuilder sb = new StringBuilder();
4
5        String wordSoFar = "";
6        for (int i = 0; i < s.length(); i++) {
7            if (s.charAt(i) == ' ') {
8                sb.append(wordSoFar);
9                sb.append(s.charAt(i));
10                wordSoFar = "";
11            }
12            else {
13                wordSoFar = s.charAt(i) + wordSoFar;
14            }
15        }
16        if (wordSoFar.length() > 0) {
17            sb.append(wordSoFar);
18        }
19
20        return sb.toString();
21    }
22}