please include function flatInfoBox.

static JWindow showTempWindowInTopRightCorner(JComponent c) {
  ret showTempWindowInTopRightCorner(c, flatInfoBox_defaultTime);
}

static JWindow showTempWindowInTopRightCorner(final JComponent c, final double seconds) {
  if (isHeadless()) null;
  final JWindow window = showWindowInTopRightCorner(c);
  disposeWindowAfter(iround(seconds*1000), window);
  ret window;
}