class App {

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


    try (var ignored = new SlidingDoor()) {
      LOGGER.info("Walking in.");
    }

    try (var ignored = new TreasureChest()) {
      LOGGER.info("Looting contents.");
    }
  
<no_super_class>