CardLayout Trouble

[eLancaster]

I've written this program where you have a CardLayout which switches between two panels based on which of the two buttons are pressed.
The problem is that the panels aren't visible.

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.FlowLayout;
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.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;


public class Whatever {
	
	CardLayout deckOfPanels;
	JFrame frame;
	JPanel panel;
	JPanel gamePanel;
	JPanel aboutPanel;
	
	public Whatever()
	{
		frame = new JFrame("Example");
		
		gamePanel = new JPanel();
		gamePanel.add(new JButton("I'm a button"));
		
		aboutPanel = new JPanel();
		aboutPanel.add(new JLabel("Some stuff"));
		
		deckOfPanels = new CardLayout();
		deckOfPanels.addLayoutComponent(gamePanel, "Game");
		deckOfPanels.addLayoutComponent(aboutPanel, "About");
		
		panel = new JPanel(deckOfPanels);
		panel.setBackground(Color.WHITE);
		
		JPanel anotherPanel = new JPanel(new FlowLayout());
		JButton button1 = new JButton("Game Panel");
		button1.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					System.out.print("y");
					deckOfPanels.show(panel,"Game");
				}
			}
		);
		anotherPanel.add(button1);
		
		JButton button2 = new JButton("About Panel");
		button2.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					System.out.print("o\n");
					deckOfPanels.last(panel);
				}
			}
		);
		anotherPanel.add(button2);
		frame.getContentPane().add(BorderLayout.NORTH, anotherPanel);
		frame.getContentPane().add(BorderLayout.CENTER, panel);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(400,400);
		frame.setVisible(true);
	}
	
	public static void main(String args[])
	{
		new Whatever();
	}
}

[camickr]

The components need to be added to the panel, not the layout.

See: How to Use CardLayout (The Java™ Tutorials > Creating a GUI With JFC/Swing > Laying Out Components Within a Container) for a working example.

[eLancaster]

Thanks, my bad.

Just writing the correct code here:

import java.awt.BorderLayout;
import java.awt.CardLayout;
import java.awt.Color;
import java.awt.FlowLayout;
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.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JPanel;


public class Whatever {
	
	CardLayout deckOfPanels;
	JFrame frame;
	JPanel panel;
	JPanel gamePanel;
	JPanel aboutPanel;
	
	public Whatever()
	{
		frame = new JFrame("Example");
		
		gamePanel = new JPanel();
		gamePanel.add(new JButton("I'm a button"));
		
		aboutPanel = new JPanel();
		aboutPanel.add(new JLabel("Some stuff"));
		
		deckOfPanels = new CardLayout();
		
		
		panel = new JPanel(deckOfPanels);
		panel.setBackground(Color.WHITE);
		panel.add(gamePanel, "Game");
		panel.add(aboutPanel, "About");
		
		JPanel anotherPanel = new JPanel(new FlowLayout());
		JButton button1 = new JButton("Game Panel");
		button1.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					System.out.print("y");
					deckOfPanels.show(panel,"Game");
				}
			}
		);
		anotherPanel.add(button1);
		
		JButton button2 = new JButton("About Panel");
		button2.addActionListener(new ActionListener()
			{
				public void actionPerformed(ActionEvent event)
				{
					System.out.print("o\n");
					deckOfPanels.last(panel);
				}
			}
		);
		anotherPanel.add(button2);
		frame.getContentPane().add(BorderLayout.NORTH, anotherPanel);
		frame.getContentPane().add(BorderLayout.CENTER, panel);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setSize(400,400);
		frame.setVisible(true);
	}
	
	public static void main(String args[])
	{
		new Whatever();
	}
}