Given an input string, reverse the string word by word.
For example,
Given s = "the sky is blue",
return "blue is sky the".
解题思路：
本题方法多多，最简单的方式直接按“ ” spilt即可，JAVA实现如下：
public String reverseWords(String s) {
if (s == null || s.length() == 0)
return s;
String[] str = s.split(" ");
StringBuilder sb = new StringBuilder();
for (int i = str.length - 1; i >= 0; i--)
if (str[i].length() >= 1)
sb.append(str[i] + " ");
if (sb.length() > 1)
sb.deleteCharAt(sb.length() - 1);
return sb.toString();
}
Java for LeetCode 151 Reverse Words in a String
原文：http://www.cnblogs.com/tonyluis/p/4553964.html