class App {

  /**
   * Program entry point.
   *
   * @param args command line args
   */
  public static void main(String[] args) throws Exception {<FILL_FUNCTION_BODY>}

  private static void waiting() throws Exception {
    Thread.sleep(750);
  }
}


    var ballItem = new BallItem();
    var ballThread = new BallThread();

    ballItem.setTwin(ballThread);
    ballThread.setTwin(ballItem);

    ballThread.start();

    waiting();

    ballItem.click();

    waiting();

    ballItem.click();

    waiting();

    // exit
    ballThread.stopMe();
  
<no_super_class>