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copied!<p>I think LayeredPane is your best bet here. You would need a third panel though to contain A and B. This third panel would be the layeredPane and then panel A and B could still have a nice LayoutManagers. All you would have to do is center B over A and there is quite a lot of examples in the Swing trail on how to do this. <a href="http://java.sun.com/docs/books/tutorial/uiswing/layout/none.html" rel="noreferrer">Tutorial for positioning without a LayoutManager</a>.</p> <pre><code>public class Main { private JFrame frame = new JFrame(); private JLayeredPane lpane = new JLayeredPane(); private JPanel panelBlue = new JPanel(); private JPanel panelGreen = new JPanel(); public Main() { frame.setPreferredSize(new Dimension(600, 400)); frame.setLayout(new BorderLayout()); frame.add(lpane, BorderLayout.CENTER); lpane.setBounds(0, 0, 600, 400); panelBlue.setBackground(Color.BLUE); panelBlue.setBounds(0, 0, 600, 400); panelBlue.setOpaque(true); panelGreen.setBackground(Color.GREEN); panelGreen.setBounds(200, 100, 100, 100); panelGreen.setOpaque(true); lpane.add(panelBlue, new Integer(0), 0); lpane.add(panelGreen, new Integer(1), 0); frame.pack(); frame.setVisible(true); } /** * @param args the command line arguments */ public static void main(String[] args) { new Main(); } } </code></pre> <p>You use setBounds to position the panels inside the layered pane and also to set their sizes.</p> <p><strong>Edit to reflect changes to original post</strong> You will need to add component listeners that detect when the parent container is being resized and then dynamically change the bounds of panel A and B.</p>

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