LeetCode:Reverse Words in a String (Java)

题目：

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

".

思路：

木有任何难度的字符串处理题目。

代码：

public class Solution {
    public String reverseWords(String s) {
        if(null == s) return s;
        String[] arr = s.split(" ");
        StringBuilder sb = new StringBuilder();
        String blank = "";
        for(int i=arr.length-1;i>=0;i--) {
        	if(arr[i].equals("")) continue;
        	sb.append(blank);
        	sb.append(arr[i]);
        	blank = " ";
        }
        return sb.toString();
    }
}