Reverse Words in a String(leetcode151)

 1 public String reverseWords(String s) {
 2         String[] words = s.trim().split(" ");
 3         if(s.length() == 0 || words.length == 0) return "";
 4         StringBuilder sb = new StringBuilder();
 5         sb.append(words[words.length - 1]);
 6         for(int i = words.length - 2; i >= 0; i--){
 7             if(words[i].length() > 0){
 8             sb.append(" ");
 9             sb.append(words[i]);
10         }
11         }
12         return sb.toString();
13     }