ImageDownloadTask.java

class ImageDownloadTask implements Runnable {
  private URL imageURL;
  
  public void run() {
    for(int i = 0; i < 3; i++) {
      if(isImageDownloaded()) break; // return
    }
  }
  
  private boolean isImageDownloaded() {
    try {
      downloadImage();
      return true;
    } catch(Exception e) {
      return false;
    }
  }
  
  private downloadImage() throws Exception {
    // Your implementation
  }

}