static <A extends Component> A jFixedSize(int w, int h default w, A c) {
  if (c != null) swing {
    Dimension d = new Dimension(w, h);
    c.setMinimumSize(d);
    c.setPreferredSize(d);
    c.setMaximumSize(d);
  }
  ret c;
}

static <A extends Component> A jFixedSize(A c, Dimension d) {
  ret jFixedSize(d.width, d.height, c);
}