如何使用按钮、复选框和单选按钮

//在初始化代码中：
    ImageIcon leftButtonIcon = createImageIcon("images/right.gif");
    ImageIcon middleButtonIcon = createImageIcon("images/middle.gif");
    ImageIcon rightButtonIcon = createImageIcon("images/left.gif");

    b1 = new JButton("禁用中间按钮", leftButtonIcon);
    b1.setVerticalTextPosition(AbstractButton.CENTER);
    b1.setHorizontalTextPosition(AbstractButton.LEADING); //对于从左到右的语言环境来说，也可以使用AbstractButton.LEFT
    b1.setMnemonic(KeyEvent.VK_D);
    b1.setActionCommand("disable");

    b2 = new JButton("中间按钮", middleButtonIcon);
    b2.setVerticalTextPosition(AbstractButton.BOTTOM);
    b2.setHorizontalTextPosition(AbstractButton.CENTER);
    b2.setMnemonic(KeyEvent.VK_M);

    b3 = new JButton("启用中间按钮", rightButtonIcon);
    //使用默认的文本位置：CENTER, TRAILING (RIGHT)
    b3.setMnemonic(KeyEvent.VK_E);
    b3.setActionCommand("enable");
    b3.setEnabled(false);

    //监听按钮1和按钮3的动作。
    b1.addActionListener(this);
    b3.addActionListener(this);

    b1.setToolTipText("单击此按钮禁用中间按钮。");
    b2.setToolTipText("单击此中间按钮时不会发生任何操作。");
    b3.setToolTipText("单击此按钮启用中间按钮。");
    ...
}

public void actionPerformed(ActionEvent e) {
    if ("disable".equals(e.getActionCommand())) {
        b2.setEnabled(false);
        b1.setEnabled(false);
        b3.setEnabled(true);
    } else {
        b2.setEnabled(true);
        b1.setEnabled(true);
        b3.setEnabled(false);
    }
} 

protected static ImageIcon createImageIcon(String path) {
    java.net.URL imgURL = ButtonDemo.class.getResource(path);
    ...//为了清晰起见，省略了错误处理...
    return new ImageIcon(imgURL);
}

//在JDialog子类的构造函数中：
getRootPane().setDefaultButton(setButton);

//在初始化代码中：
    chinButton = new JCheckBox("Chin");
    chinButton.setMnemonic(KeyEvent.VK_C); 
    chinButton.setSelected(true);

    glassesButton = new JCheckBox("Glasses");
    glassesButton.setMnemonic(KeyEvent.VK_G); 
    glassesButton.setSelected(true);

    hairButton = new JCheckBox("Hair");
    hairButton.setMnemonic(KeyEvent.VK_H); 
    hairButton.setSelected(true);

    teethButton = new JCheckBox("Teeth");
    teethButton.setMnemonic(KeyEvent.VK_T); 
    teethButton.setSelected(true);

    //为复选框注册侦听器。
    chinButton.addItemListener(this);
    glassesButton.addItemListener(this);
    hairButton.addItemListener(this);
    teethButton.addItemListener(this);
...
public void itemStateChanged(ItemEvent e) {
    ...
    Object source = e.getItemSelectable();

    if (source == chinButton) {
        //...做一些处理...
    } else if (source == glassesButton) {
        //...做一些处理...
    } else if (source == hairButton) {
        //...做一些处理...
    } else if (source == teethButton) {
        //...做一些处理...
    }

    if (e.getStateChange() == ItemEvent.DESELECTED)
        //...做一些处理...
    ...
    updatePicture();
}

//在初始化代码中：
    //创建单选按钮。
    JRadioButton birdButton = new JRadioButton(birdString);
    birdButton.setMnemonic(KeyEvent.VK_B);
    birdButton.setActionCommand(birdString);
    birdButton.setSelected(true);

    JRadioButton catButton = new JRadioButton(catString);
    catButton.setMnemonic(KeyEvent.VK_C);
    catButton.setActionCommand(catString);

    JRadioButton dogButton = new JRadioButton(dogString);
    dogButton.setMnemonic(KeyEvent.VK_D);
    dogButton.setActionCommand(dogString);

    JRadioButton rabbitButton = new JRadioButton(rabbitString);
    rabbitButton.setMnemonic(KeyEvent.VK_R);
    rabbitButton.setActionCommand(rabbitString);

    JRadioButton pigButton = new JRadioButton(pigString);
    pigButton.setMnemonic(KeyEvent.VK_P);
    pigButton.setActionCommand(pigString);

    //将单选按钮分组。
    ButtonGroup group = new ButtonGroup();
    group.add(birdButton);
    group.add(catButton);
    group.add(dogButton);
    group.add(rabbitButton);
    group.add(pigButton);

    //为单选按钮注册监听器。
    birdButton.addActionListener(this);
    catButton.addActionListener(this);
    dogButton.addActionListener(this);
    rabbitButton.addActionListener(this);
    pigButton.addActionListener(this);
...
public void actionPerformed(ActionEvent e) {
    picture.setIcon(new ImageIcon("images/" 
                                  + e.getActionCommand() 
                                  + ".gif"));
}