Java - Write code to Return the size of substring that does not contain any trailing spaces

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Requirements

Write code to Return the size of substring that does not contain any trailing spaces

Demo

//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String s = "book2s.com";
        System.out.println(rightTrimSize(s));
    }/*from www.  j  a  v a 2s.  c  om*/

    /**
     * Returns the size of substring that does not contain any trailing spaces
     * @param s the string
     * @return trimmed size
     */
    public static int rightTrimSize(String s) {

        int i = s.length();

        while (i > 0) {
            i--;

            if (s.charAt(i) != ' ') {
                return i + 1;
            }
        }

        return 0;
    }
}