翻转字符串里的单词

https://leetcode-cn.com/problems/reverse-words-in-a-string/

class Solution {
    public String reverseWords(String s) {
           if(s.length() == 0) return "";
           String[] ss = s.split("\\s+");
           if(ss.length==0) return "";
           var sb = new StringBuilder();
           for(int i=ss.length-1;i>0;i--) {
              sb.append(ss[i]).append(" ");
           }
           sb.append(ss[0]);
           return sb.toString().trim();
    }
}