Reverse Words in a String

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本文介绍了一种算法，该算法能够接收一个字符串输入，并按单词单位进行反转操作。例如，将输入theskyisblue转换为blue issky the。文章详细解释了如何定义单词并处理输入字符串中的空白字符。

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

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

Clarification:

What constitutes a word?
A sequence of non-space characters constitutes a word.
Could the input string contain leading or trailing spaces?
Yes. However, your reversed string should not contain leading or trailing spaces.
How about multiple spaces between two words?
Reduce them to a single space in the reversed string.

public static String reverseWords(String s) {
        if(s == null){
            return s;
        }else if(s.trim().indexOf(" ") < 0){
            return s.trim();
        }else{
            String[] words = s.trim().split("\\s+");
            String result = "";
            for(int i=(words.length - 1); i>=0; i--){
                result = result + " " + words[i];
            }
            
            return result.trim();
        }
    }