JAVA - Card Layout

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package tcardlayout;

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

import java.net.*;

public class TCardLayout extends JApplet {

    // 1. Declare some panel and button references.

    JPanel controlPanel;

    JPanel cardsPanel, swCompPanel, aeroCompPanel;

    JButton nextButton, previousButton;

    JButton javasoftButton, sunButton,

            ibmButton, netscapeButton;

    JButton nasaButton, boeingButton,

            lockheedButton, northropButton;

    URL currentSite = null;

    // 2. Define the string arrays for the sites and site urls.

    String[] swCompSites = {"JavaSoft", "Sun",

                            "IBM", "NetScape"};

    String[] aeroCompSites = {"NASA", "Boeing",

                              "Lockheed", "Northrop"};

    String[] siteURLs = { "http://www.javasoft.com/",

                          "http://www.sun.com/",

                          "http://www.ibm.com/",

                          "http://www.netscape.com/" };

    Container container = null;

    public void init() {

       // 3. Get a handle on the applet's content pane.

       container = this.getContentPane();

       // 4. Create a control panel object.

       controlPanel = new JPanel();

       controlPanel.setLayout(new GridLayout(1,2,10,10));

       // 5. Create and add the next and previous control buttons.

       ButtonListener listener = new ButtonListener();

       nextButton = new JButton("Next Card");

       nextButton.setActionCommand("Next Button");

       nextButton.addActionListener(listener);

       controlPanel.add(nextButton);

       previousButton = new JButton("Previous Card");

       previousButton.setEnabled(false);

       previousButton.setActionCommand("Previous Button");

       previousButton.addActionListener(listener);

       controlPanel.add(previousButton);

       // 6. Create a panel to contain the cards.

       /* Each card will display a set of buttons to

          visit a specific Web site. */

       cardsPanel = new JPanel();

       cardsPanel.setLayout(new CardLayout());

       swCompPanel = new JPanel();

       aeroCompPanel = new JPanel();

       swCompPanel.setLayout(new GridLayout(2,2,10,10));

       aeroCompPanel.setLayout(new GridLayout(2,2,10,10));

       // 7. Add buttons to the these cards.

       for (int i=0; i<swCompSites.length; i++) {

           JButton b = new JButton(swCompSites[i]);

           b.addActionListener(listener);

           b.setActionCommand(swCompSites[i]);

           swCompPanel.add(b);

       }

       for (int i=0; i<aeroCompSites.length; i++) {

           JButton b = new JButton(aeroCompSites[i]);

           b.addActionListener(listener);

           b.setActionCommand(aeroCompSites[i]);

           aeroCompPanel.add(b);

       }

       // 8. Add the company-list panels to cards panel.

       cardsPanel.add("Next Card", swCompPanel);

       cardsPanel.add("Previous Card", aeroCompPanel);

       // 9. Finally, add the control and the cards panels to

       // the applet's content pane.

       ((BorderLayout)container.getLayout()).setVgap(10);

       container.add("North", controlPanel);

       container.add("Center", cardsPanel);

    }

    // 10. Functionality to be executed when the next-button

    // is activated.

    public void showNextCard() {

       nextButton.setEnabled(false);

       ((CardLayout) cardsPanel.getLayout()).next(cardsPanel);

       previousButton.setEnabled(true);

    }

    // 11. Functionality to be executed when the previous-button

    // is activated.

    public void showPreviousCard() {

       previousButton.setEnabled(false);

       ((CardLayout) cardsPanel.getLayout()).previous(cardsPanel);

       nextButton.setEnabled(true);

    }

    // 12. Functionality to display the specific Web page.

    public void toDestination(String aSite) {

       System.out.println("Connecting to the web site...");

       try {

           currentSite = new URL(aSite);

       }

       catch (MalformedURLException e) {

          System.out.println("Unknown URL Address: " + aSite);

       }

       getAppletContext().showDocument(currentSite);

    }

    // 13. The action listener class.

    class ButtonListener implements ActionListener {

        public void actionPerformed(ActionEvent ae) {

            JButton tempButton = (JButton) ae.getSource();

            // 14. If the next or previous buttons are pressed...

            if (tempButton.getActionCommand() == "Next Button") {

                showNextCard();

            }

            else if (tempButton.getActionCommand() == "Previous Button") {

                showPreviousCard();

            }

            // 15. If the Web site buttons are pressed...

            for (int i=0; i<swCompSites.length; i++) {

                if (tempButton.getActionCommand() == swCompSites[i])

                    toDestination(siteURLs[i]);

            }

        }

    }

}