Java StringBuilder repeat String

//package com.demo2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String sourceString = "demo2s.com";
        int factor = 2;
        System.out.println(repeat(sourceString, factor));
    }// www.  ja  v a 2 s.c  o  m

    /**
     * Returns sourceString concatenated together 'factor' times.
     *
     * @param sourceString The string to repeat
     * @param factor  The number of times to repeat it.
     */
    public static String repeat(String sourceString, int factor) {
        if (factor < 1) {
            return "";
        }
        if (factor == 1) {
            return sourceString;
        }

        StringBuilder sb = new StringBuilder(factor * sourceString.length());

        while (factor > 0) {
            sb.append(sourceString);
            factor--;
        }

        return sb.toString();
    }

}