static void swingLater(long delay, final O r) {
  javax.swing.Timer timer = new javax.swing.Timer(toInt(delay), actionListener(wrapAsActivity(r)));
  timer.setRepeats(false);
  timer.start();
}

static void swingLater(O r) {
  var runnable = toRunnable(r);
  executingSwingCode(runnable);
  SwingUtilities.invokeLater(runnable);
}