[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".

Clarification:

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

Https://oj.leetcode.com/problems/reverse-words-in-a-string/

 

Idea: Use the split method to split the data and then traverse it in reverse order to add it to the result.

 

/** * http://blog.csdn.net/perfect8886/article/details/20833685 *  * */public class Solution {    public String reverseWords(String s) {        String[] a = s.split(" ");        StringBuilder sb = new StringBuilder();        for (int i = a.length - 1; i >= 0; i--) {            if (!a[i].equals("")) {                sb.append(a[i]);                sb.append(" ");            }        }        if (sb.length() > 1)            sb.deleteCharAt(sb.length() - 1);        return sb.toString();    }    public static void main(String[] args) {        System.out.println(new Solution().reverseWords("the sky is blue"));    }}