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ButtonDemoApplet.javaAPI DocExample2792Tue Dec 12 18:58:52 GMT 2000None

ButtonDemoApplet

public class ButtonDemoApplet 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
Constructors Summary
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 codeBase = getCodeBase();
        URL url = null;

        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()


       
        ImageIcon leftButtonIcon = new ImageIcon(
                                        getURL(leftButtonFilename));
        ImageIcon middleButtonIcon = new ImageIcon(
                                        getURL(middleButtonFilename));
        ImageIcon rightButtonIcon = new ImageIcon(
                                        getURL(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);

        //Add Components to a JPanel, using the default FlowLayout. 
        JPanel pane = new JPanel();
        pane.add(b1);
        pane.add(b2);
        pane.add(b3);

        //Make the JPanel this applet's content pane.
        setContentPane(pane);