import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.Color; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.BoxLayout; import javax.swing.ButtonGroup; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRadioButton; public class Layout4 implements ActionListener { JPanel cards; //a panel that uses CardLayout final static String[] strings = {"Component 1", "Component 2 is so long-winded it makes the container wide", "Component 3"}; private static JComponent createComponent(String s) { JLabel l = new JLabel(s); l.setBorder(BorderFactory.createMatteBorder(5,5,5,5, Color.DARK_GRAY)); l.setHorizontalAlignment(JLabel.CENTER); return l; } public void addCardsToPane(Container pane) { JRadioButton[] rb = new JRadioButton[strings.length]; ButtonGroup group = new ButtonGroup(); JPanel buttons = new JPanel(); buttons.setLayout(new BoxLayout(buttons, BoxLayout.PAGE_AXIS)); for (int i= 0; i < strings.length; i++) { rb[i] = new JRadioButton("Show component #" + (i+1)); rb[i].setActionCommand(String.valueOf(i)); rb[i].addActionListener(this); group.add(rb[i]); buttons.add(rb[i]); } rb[0].setSelected(true); //Create the panel that contains the "cards". cards = new JPanel(new CardLayout()); for (int i = 0; i < strings.length; i++) { cards.add(createComponent(strings[i]), String.valueOf(i)); } pane.add(buttons, BorderLayout.NORTH); pane.add(cards, BorderLayout.CENTER); } public void actionPerformed(ActionEvent evt) { CardLayout cl = (CardLayout)(cards.getLayout()); cl.show(cards, (String)evt.getActionCommand()); } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("Layout4"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. Layout4 demo = new Layout4(); demo.addCardsToPane(frame.getContentPane()); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }