How to Use CardLayout to Switch JPanels Inside a JFrame?

How to Switch JPanels inside a JFrame Using CardLayout

Switching JPanels within a JFrame can be a straightforward task. Let's explore how to effectively achieve this using a technique called CardLayout.

The following code snippet provides an example of how to use CardLayout:

<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");</code>

Here, we create a CardLayout instance called cardLayout and a main panel, mainPanel, that uses this layout manager. We then add two panels, menu and game, to the mainPanel with their respective names, "menu" and "game".

When you call the gameOn() method, it changes the visibility of the panels using cardLayout.show(). For instance, the following code:

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

will hide the menu panel and display the game panel at the front. This method avoids the need for adding and removing components constantly, which can be inefficient.

Here's an example you can run:

<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() {
        // ... (similar to previous example)
    }

    // ...

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

    public void gameOn() {
        // ... (similar to previous example)
    }

    public static void main(String[] args) {
        // ... (similar to previous example)
    }
}</code>

This example demonstrates the use of CardLayout to seamlessly switch between the menu and game panels within a JFrame.

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