58. 最后一个单词的长度

58. 最后一个单词的长度

class Solution {
    public int lengthOfLastWord(String s) {
        if (s == null || s.length() == 0)
            return 0;
        int high = s.length() - 1;
        while (high >= 0 && s.charAt(high) == ' ')
            --high;
        if (high < 0)
            return 0;
        int low = high - 1;
        while (low >= 0 && s.charAt(low) != ' ')
            --low;
        return high - low;
    }
}