コンボボックスの選択に基づいて UI 要素を動的に切り替えるにはどうすればよいですか?

<code class="java">import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class CardBoxExample {

    private static final CardLayout cardLayout = new CardLayout();
    private static final JPanel cards = new JPanel(cardLayout);
    private static final JComboBox<String> combo = new JComboBox<>();

    public static void main(String[] args) {
        // Create the cards
        JPanel panel1 = new JPanel();
        panel1.setBackground(Color.RED);
        JPanel panel2 = new JPanel();
        panel2.setBackground(Color.GREEN);
        cards.add(panel1, "Panel 1");
        cards.add(panel2, "Panel 2");

        // Add the combo box
        JPanel control = new JPanel();
        combo.addItem("Panel 1");
        combo.addItem("Panel 2");
        combo.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                cardLayout.show(cards, combo.getSelectedItem().toString());
            }
        });
        control.add(combo);

        // Create the frame and add the components
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(cards, BorderLayout.CENTER);
        frame.add(control, BorderLayout.SOUTH);
        frame.pack();
        frame.setVisible(true);
    }
}</code>