Generate video URLs from template

Sometimes, a website has a lot of video under almost the same url - the only difference is a video number. To simply generate them :

public static void main(String[] args)  {

    Downloader downloader = new Downloader();

    downloader.urlTemplate = "https://website/video_%s.mp4";
    downloader.numberOfAllVideos = 10;
    downloader.writeURLsToFile("C:\\Users\\Aleksander\\Desktop\\generated_urls.txt");
}

As a result, file generated_urls.txt was created on my desktop, with this content :

https://website/video_00.mp4 https://website/video_01.mp4 ...https://website/video_09.mp4 https://website/video_10.mp4