JPanel c2 = new JPanel();
c2.setMinimumSize(new Dimension(40, 40));
c2.setPreferredSize(new Dimension(50, 50));
c2.setMaximumSize(new Dimension(60, 60));
c.add(c2);
OverlayLayout l = new OverlayLayout(c);
h.check(l.minimumLayoutSize(c).width, 40);
h.check(l.minimumLayoutSize(c).height, 40);
}