LeetCode----------------------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

"

程序如下：

public class Solution {

public String reverseWords(String s) {

String[] strings = s .trim().split("\\s+");

ArrayList<String> reverseString = new ArrayList<String>();

int sLength = strings.length;

for(int i = sLength - 1;i >= 0;i--){

reverseString.add(strings[i]);

}

String reverse = reverseString.toString();

reverse = reverse.substring(1,reverse.length()-1).replace(", "," ");

return reverse;

}

}

过程中有点挫折：split()函数匹配的正则表达式没弄清楚，若字符串两段有空格以及两字符串之间有多个字符串应该s .trim().split("\\s+");

下一步学习一下正则表达式。