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    <p>Here is a very simple example of something that should approximate your description. On the left, we have a hug button to toggle the content of the right panel. On the right, you have a panel with a given border and a label. When you press the button, the content on the right is swapped with the other panel.</p> <pre><code>import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.SwingUtilities; public class TestCardLayout2 { protected void initUI() { JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel leftPanel = new JPanel(new BorderLayout()); JLabel label = new JLabel("Left panel"); leftPanel.add(label, BorderLayout.NORTH); JButton button = new JButton("Toggle right panel"); leftPanel.add(button); frame.add(leftPanel, BorderLayout.WEST); final CardLayout cardLayout = new CardLayout(); final JPanel rightPanel = new JPanel(cardLayout); rightPanel.setPreferredSize(new Dimension(200, 500)); JPanel rightPanel1 = new JPanel(new FlowLayout(FlowLayout.LEFT)); rightPanel1.setBorder(BorderFactory.createLineBorder(Color.RED)); JPanel rightPanel2 = new JPanel(new FlowLayout(FlowLayout.RIGHT)); rightPanel2.setBorder(BorderFactory.createLineBorder(Color.BLUE)); JLabel label1 = new JLabel("Right panel 1 with a red border"); JLabel label2 = new JLabel("Right panel 2 with a blue borer"); rightPanel1.add(label1); rightPanel2.add(label2); rightPanel.add(rightPanel1, "panel1"); rightPanel.add(rightPanel2, "panel2"); frame.add(rightPanel, BorderLayout.EAST); button.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { cardLayout.next(rightPanel); } }); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { @Override public void run() { new TestCardLayout2().initUI(); } }); } } </code></pre>
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    1. POHow can I replace one of two JPanels with another JPanel in Java?
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    1. USGuillaume Polet
    1. USGuillaume Polet
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      1. VTUpMod
    1. COException in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: cannot add to layout: constraint must be a string ...
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      1. USSami Eltamawy
    2. CO@AbdEl-RahmanEl-Tamawy My bad, in version prior to JVM7, you have to provide a "String" constraint when you add components to the container using the CardLayout. You can pass any String as a second argument of the `add` method, as long as you make sure that they are all different for all components contained.
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      1. USGuillaume Polet
    3. CO@AbdEl-RahmanEl-Tamawy I added the two `String` "constraints" so that it works in all Java version
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      1. USGuillaume Polet
 

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