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".

click to show clarification.

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 class Solution {    public String reverseWords(String s) {        s = s.trim();        String[] strArr = s.split("[ ]+");        StringBuilder sb = new StringBuilder();                for (int i = strArr.length - 1; i >= 0; i--) {            sb.append(strArr[i]);                        if (i != 0) sb.append(" ");        }                return sb.toString();    }}