The title could be: How to Switch Between JPanels in a JFrame Using CardLayout?

How Can I Transition Between JPanels within a JFrame?

Initial Question:

A beginner in Java components seeks assistance in switching between MenuPanel and GamePanel within a JFrame. The current code only creates a blank JFrame upon calling gameOn(), rather than initiating the game. Suggestions are welcomed to resolve this issue, taking into account the presence of a mouse listener in MenuPanel.

Solution:

Instead of employing the approach of removing and adding components, it is advisable to utilize a CardLayout. This allows for the seamless transition between panels without the need for repeated addition and removal.

Code Implementation:

<code class="java">CardLayout cardLayout = new CardLayout();
JPanel mainPanel = new JPanel(cardLayout);

MenuPanel menu = new MenuPanel();
GamePanel game = new GamePanel();
mainPanel.add(menu, "menu");
mainPanel.add(game, "game");

...
public void gameOn() {
    cardLayout.show(mainPanel, "game");
}</code>

Explanation:

• When gameOn() is invoked, the MenuPanel will be pushed to the back and rendered as hidden, while the GamePanel will be brought to the front and displayed.

Example:

For a practical demonstration, consider the following code:

<code class="java">import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

public class GameFrame extends JFrame implements ActionListener{

    CardLayout cardLayout;
    JPanel mainPanel;
    MenuPanel menu;
    GamePanel game;

    public GameFrame() {
        cardLayout = new CardLayout();
        mainPanel = new JPanel(cardLayout);
        menu = new MenuPanel();
        game = new GamePanel();
        mainPanel.add(menu, "menu");
        mainPanel.add(game, "game");


        JButton goGame = new JButton("Go TO Game");
        goGame.addActionListener(this);

        add(mainPanel);
        add(goGame, BorderLayout.SOUTH);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        pack();
        setLocationByPlatform(true);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        gameOn();
    }

    public void gameOn() {
        cardLayout.show(mainPanel, "game");
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable(){
            @Override
            public void run() {
                GameFrame gameFrame = new GameFrame();
            }
        });
    }
}

class MenuPanel extends JPanel {

    public MenuPanel() {
        setBackground(Color.GREEN);
        add(new JLabel("Menu"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(300, 300);
    }
}

class GamePanel extends JPanel {

    public GamePanel() {
        setBackground(Color.BLUE);
        add(new JLabel("Game"));
    }

    @Override
    public Dimension getPreferredSize() {
        return new Dimension(300, 300);
    }
}</code>

This implementation showcases the use of CardLayout to smoothly transition between the MenuPanel and GamePanel within a JFrame.

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