Reverse Words in a String

Given an input string s, reverse the order of the words.

A word is defined as a sequence of non-space characters. The words in s will be separated by at least one space.

Return a string of the words in reverse order concatenated by a single space.

Note that s may contain leading or trailing spaces or multiple spaces between two words. The returned string should only have a single space separating the words. Do not include any extra spaces.

LeetCode Problem - 151: Link | Click Here

class Solution {
    public String reverseWords(String s) {
        // Create a StringBuilder to build the reversed string
        StringBuilder sb = new StringBuilder();

        // Remove extra spaces between words by replacing multiple spaces with a single space
        String removeExtraSpace = s.replaceAll("\\s+", " ");

        // Split the string into an array of words using space as the delimiter
        String[] resultString = removeExtraSpace.split(" ");

        // Iterate through the array of words in reverse order and append each word to the StringBuilder
        for (int j = resultString.length - 1; j >= 0; j--) {
            sb.append(resultString[j]).append(" ");
        }

        // Convert the StringBuilder to a string and trim any leading or trailing spaces
        String reversedString = sb.toString().trim();

        // Return the final reversed string
        return reversedString;
    }
}