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AppletDemo.javaAPI DocExample4562Tue Dec 12 18:59:14 GMT 2000None

AppletDemo

public class AppletDemo extends JApplet implements ActionListener

Fields Summary
protected JButton
b1
protected JButton
b2
protected JButton
b3
protected static final String
DISABLE
protected static final String
ENABLE
protected String
leftButtonFilename
protected String
middleButtonFilename
protected String
rightButtonFilename
private boolean
inAnApplet
URL
codeBase
Constructors Summary
public AppletDemo()

 //used for applet version only

    //Hack to avoid ugly message about system event access check.
      
        this(true);
public AppletDemo(boolean inAnApplet)

        this.inAnApplet = inAnApplet;
        if (inAnApplet) {
            getRootPane().putClientProperty("defeatSystemEventQueueCheck",
                                            Boolean.TRUE);
        }
Methods Summary
public voidactionPerformed(java.awt.event.ActionEvent e)

        if (e.getActionCommand().equals(DISABLE)) {
            b2.setEnabled(false);
            b1.setEnabled(false);
            b3.setEnabled(true);
        } else {
            b2.setEnabled(true);
            b1.setEnabled(true);
            b3.setEnabled(false);
        }
protected java.net.URLgetURL(java.lang.String filename)

        URL url = null;
        if (codeBase == null) {
            codeBase = getCodeBase();
        }

        try {
            url = new URL(codeBase, filename);
        } catch (java.net.MalformedURLException e) {
            System.out.println("Couldn't create image: badly specified URL");
            return null;
        }

        return url;
public voidinit()

        setContentPane(makeContentPane());
public static voidmain(java.lang.String[] args)

        JFrame frame = new JFrame("Application version: AppletDemo");

        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });

        AppletDemo applet = new AppletDemo(false);
        frame.setContentPane(applet.makeContentPane());
        frame.pack();
        frame.setVisible(true);
public java.awt.ContainermakeContentPane()

        ImageIcon leftButtonIcon;
        ImageIcon middleButtonIcon;
        ImageIcon rightButtonIcon;

        if (inAnApplet) {
            URL leftButtonURL = getURL(leftButtonFilename);
            URL middleButtonURL = getURL(middleButtonFilename);
            URL rightButtonURL = getURL(rightButtonFilename);

            leftButtonIcon = new ImageIcon(leftButtonURL);
            middleButtonIcon = new ImageIcon(middleButtonURL);
            rightButtonIcon = new ImageIcon(rightButtonURL);
        } else {
            leftButtonIcon = new ImageIcon(leftButtonFilename);
            middleButtonIcon = new ImageIcon(middleButtonFilename);
            rightButtonIcon = new ImageIcon(rightButtonFilename);
        }

        b1 = new JButton("Disable middle button", leftButtonIcon);
        b1.setVerticalTextPosition(AbstractButton.CENTER);
        b1.setHorizontalTextPosition(AbstractButton.LEFT);
        b1.setMnemonic(KeyEvent.VK_D);
        b1.setActionCommand(DISABLE);

        b2 = new JButton("Middle button", middleButtonIcon);
        b2.setVerticalTextPosition(AbstractButton.BOTTOM);
        b2.setHorizontalTextPosition(AbstractButton.CENTER);
        b2.setMnemonic(KeyEvent.VK_M);

        b3 = new JButton("Enable middle button", rightButtonIcon);
        //Use the default text position of CENTER, RIGHT.
        b3.setMnemonic(KeyEvent.VK_E);
        b3.setActionCommand(ENABLE);
        b3.setEnabled(false);

        //Listen for actions on buttons 1 and 3.
        b1.addActionListener(this);
        b3.addActionListener(this);

        b1.setToolTipText("Click this button to disable the middle button.");
        b2.setToolTipText("This middle button does nothing when you click it.");
        b3.setToolTipText("Click this button to enable the middle button.");

        //Add Components to a JPanel, using the default FlowLayout. 
        JPanel pane = new JPanel();
        pane.add(b1);
        pane.add(b2);
        pane.add(b3);
        pane.setBackground(new Color(255,255,204));
        pane.setBorder(BorderFactory.createMatteBorder(1,1,2,2,Color.black));

        return pane;