Reverse Words in a String

public class Solution {
    /**
     * @param s : A string
     * @return : A string
     */
    public static String reverseWords(String s){
        if (s == null || s.isEmpty()){
            return s;
        }
        String result = "";
        String[] strings = s.split(" ");
        for (int index = strings.length - 1; index >= 0; index--){
            result = result.concat(strings[index]).concat(" ");
        }
        return result.trim();
    }
}