How can I replace one of two JPanels with another JPanel in Java?

Question

I designed an interface for the welcome screen with one JFrame included two JPanels (JPanel1 on right and JPanel2 on left). The buttons on the left is to switch the Panels in JP

Answer 1

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.

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();
            }
        });
    }

}