Reverse Words in a String

Given an input string, reverse the string word by word.

For example,
Given s = "the sky is blue",

return "blue is sky the".

public class Solution {    public String reverseWords(String s) {        //"\\s"表示空格,回车,换行等空白符，"+"表示一个或多个        String[] parts = s.trim().split("\\s+");        String out = "";        if (parts.length > 0) {            for (int i = parts.length - 1; i > 0; i--) {                out += parts[i] + " ";            }            out += parts[0];        }        return out;    }}