Reverse Words in a String

Problem

Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.

Example 1:

Input: "Let's take LeetCode contest"
Output: "s'teL ekat edoCteeL tsetnoc"

Note: In the string, each word is separated by single space and there will not be any extra space in the string.

Solution

public class Solution {
    public String reverseWords(String s) {
        if (s == null || s.length() == 0) return s;
        StringBuilder sb = new StringBuilder();
        for (String token : s.split(" +")) {
            sb.append(new StringBuilder(s).reverse()).append(" ");
        }
        return sb.toString().trim();
    }
}

Analysis

Easy and straightforward solution
If reverse() or trim() is not allowed in the interview
Then use toCharArray() to convert given input string as array then do the operations