557. 反转字符串中的单词 III

    public String reverseWords(String s) {
        String[] words = s.split(" ");
        StringBuilder result = new StringBuilder();
        StringBuilder w = new StringBuilder();
        for (String word : words) {
            result.append(w.append(word).reverse()).append(" ");
            w.setLength(0);
        }
        return result.toString().trim();
    }