Leetcode 151（Java）

Total Accepted: 154413
Total Submissions: 982629
Difficulty: Medium
Contributor: LeetCode
Given an input string, reverse the string word by word.

For example,
Given s = “the sky is blue”,
return “blue is sky the”.

Update (2015-02-12):
For C programmers: Try to solve it in-place in O(1) space.

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自己写出来以后看了别人的代码，精简的多。主要是自己对于JAVA自带的方法还不是特别的熟悉，AC码如下，要注意在split（）方法中，‘+’号是正则表达式里的意思，如果真正要使用+号需要转义：

    public String reverseWords(String s) {        String[] substr = s.trim().split(" +");        Collections.reverse(Arrays.asList(substr));        return String.join(" ",substr);    }