radioButtons[2].setActionCommand(questionCommand);        radioButtons[3] = new JRadioButton("錯誤圖標");        radioButtons[3].setActionCommand(errorCommand);        radioButtons[4] = new JRadioButton("警告圖標");        radioButtons[4].setActionCommand(warningCommand);        radioButtons[5] = new JRadioButton("自定義圖標");        radioButtons[5].setActionCommand(customCommand);        for (int i = 0; i < numButtons; i++) {            group.add(radioButtons[i]);        }        radioButtons[0].setSelected(true);        showItButton = new JButton("顯示");        showItButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                String command = group.getSelection().getActionCommand();                //沒有圖標                if (command == plainCommand) {                    JOptionPane.showMessageDialog(frame,                                    "水煮魚里不要放酸菜！",                                    "無圖標",                                    JOptionPane.PLAIN_MESSAGE);                //信息圖標                } else if (command == infoCommand) {                    JOptionPane.showMessageDialog(frame,                                    "水煮魚里不要放酸菜！",                                    "信息圖標",                                    JOptionPane.INFORMATION_MESSAGE);                //問題圖標                } else if (command == questionCommand) {                    JOptionPane.showMessageDialog(frame,                                    "請你吃飯前洗手，好嗎？",                                    "問題",                                    JOptionPane.QUESTION_MESSAGE);                //錯誤圖標                } else if (command == errorCommand) {                    JOptionPane.showMessageDialog(frame,                                    "對不起，你的信用卡沒有資金了！",                                    "錯誤信息",                                    JOptionPane.ERROR_MESSAGE);                //警告圖標                } else if (command == warningCommand) {                    JOptionPane.showMessageDialog(frame,                                    "警告！你嚴重透支信用卡，請盡快補齊金額！",                                    "警告信息",                                    JOptionPane.WARNING_MESSAGE);                //自定義圖標                } else if (command == customCommand) {                    JOptionPane.showMessageDialog(frame,                                    "哈哈。我想用什么圖標都可以！",                                    "自定義對話窗",                                    JOptionPane.INFORMATION_MESSAGE,                                    icon);                }            }        });        return create2ColPane(iconDesc + ":",                              radioButtons,                              showItButton);    }/** *<br>方法說明：創建一個JPanel，放在第二個選項卡上 *<br>輸入參數： *<br>返回類型： */    private JPanel createFeatureDialogBox() {        final int numButtons = 5;        JRadioButton[] radioButtons = new JRadioButton[numButtons];        final ButtonGroup group = new ButtonGroup();        JButton showItButton = null;        //定義操作命令        final String pickOneCommand = "pickone";        final String textEnteredCommand = "textfield";        final String nonAutoCommand = "nonautooption";        final String customOptionCommand = "customoption";        final String nonModalCommand = "nonmodal";        //定義radio數組        radioButtons[0] = new JRadioButton("選擇一個");        radioButtons[0].setActionCommand(pickOneCommand);        radioButtons[1] = new JRadioButton("輸入信息");        radioButtons[1].setActionCommand(textEnteredCommand);        radioButtons[2] = new JRadioButton("關閉按鈕無效");        radioButtons[2].setActionCommand(nonAutoCommand);        radioButtons[3] = new JRadioButton("輸入校驗"                                           + "(用戶輸入信息)");        radioButtons[3].setActionCommand(customOptionCommand);        radioButtons[4] = new JRadioButton("沒有模式");        radioButtons[4].setActionCommand(nonModalCommand);        //合成一個組群        for (int i = 0; i < numButtons; i++) {            group.add(radioButtons[i]);        }        //設置第一個為默認選擇        radioButtons[0].setSelected(true);        showItButton = new JButton("顯示");        showItButton.addActionListener(new ActionListener() {            public void actionPerformed(ActionEvent e) {                String command = group.getSelection().getActionCommand();                //選擇一個                if (command == pickOneCommand) {                    Object[] possibilities = {"辣椒", "西紅柿", "洋蔥"};                    //設置對話框                    String s = (String)JOptionPane.showInputDialog(                                        frame,    //所屬窗體                                        "請選擇項目：\n"                                        + "\"雞蛋炒\"",  //輸出信息                                        "客戶選擇",                                        JOptionPane.PLAIN_MESSAGE,  //對話框模式                                        icon,           //顯示圖標                                        possibilities,   //選項內容                                        "辣椒");    //默認選項                    //如果有選擇                    if ((s != null) && (s.length() > 0)) {                        setLabel("雞蛋炒" + s + "!");                        return;                    }                    //如果客戶沒有選擇                    setLabel("快點！");                //文本輸入                } else if (command == textEnteredCommand) {                    String s = (String)JOptionPane.showInputDialog(                                        frame,                                        "選擇一個配料\n"                                        + "\"雞蛋炒\"",                                        "客戶輸入",                                        JOptionPane.PLAIN_MESSAGE,                                        icon,                                        null,                                        "辣椒");                    //如果用戶有輸入                    if ((s != null) && (s.length() > 0)) {                        setLabel("你要的是雞蛋炒" + s + "！");                        return;                    }                    //如果返回的是空或者是null。                    setLabel("快些選擇！");                //關閉按鈕無效                } else if (command == nonAutoCommand) {                    //構造一個對話框面板                    final JOptionPane optionPane = new JOptionPane(                                    "關閉這個對話框\n"                                    + "請點擊下面的按鈕\n"                                    + "明白嗎？",                                    JOptionPane.QUESTION_MESSAGE,                                    JOptionPane.YES_NO_OPTION);                    JDialog.setDefaultLookAndFeelDecorated(false);                    //構造一個對話框                    final JDialog dialog = new JDialog(frame,                                                 "點擊一個按鈕",                                                 true);                    //將對話框面板添加到對話框中                    dialog.setContentPane(optionPane);                    //設置對話框關閉時的操作模式                    dialog.setDefaultCloseOperation(                        JDialog.DO_NOTHING_ON_CLOSE);                    dialog.addWindowListener(new WindowAdapter() {                        public void windowClosing(WindowEvent we) { //當點擊關閉按鈕                            setLabel("阻礙用戶視圖關閉窗體！");                        }                    });                                        JDialog.setDefaultLookAndFeelDecorated(true);                                        optionPane.addPropertyChangeListener(                        new PropertyChangeListener() {                            public void propertyChange(PropertyChangeEvent e) {                                String prop = e.getPropertyName();                                if (dialog.isVisible()                                 && (e.getSource() == optionPane)                                 && (JOptionPane.VALUE_PROPERTY.equals(prop))) {                                    //如果你要阻止關閉按鈕，可以在這里進行處理。                                                                        dialog.setVisible(false);                                }                            }                        });                    dialog.pack();                    dialog.setLocationRelativeTo(frame);                    dialog.setVisible(true);                                        int value = ((Integer)optionPane.getValue()).intValue();                    if (value == JOptionPane.YES_OPTION) {                        setLabel("好的");                    } else if (value == JOptionPane.NO_OPTION) {                        setLabel("試圖點擊關閉按鈕來關閉一個不能關閉的對話框！"                                 + "你不能！");                    } else {                        setLabel("窗體可以使用ESC鍵關閉。");                    }                 //自己定義版面                } else if (command == customOptionCommand) {                    customDialog.setLocationRelativeTo(frame);                    customDialog.setVisible(true);                    String s = customDialog.getValidatedText();                    if (s != null) {                        //The text is valid.                        setLabel("歡迎你！"                                 + "你已經進入了\""                                 + s                                 + "\"。");                    }                //沒有模式                } else if (command == nonModalCommand) {                    //創建一個對話框                    final JDialog dialog = new JDialog(frame,                                                       "一個沒有模式的對話框");                    //使用html語言來顯示信息                    JLabel label = new JLabel("<html><p align=center>"                        + "這是一個沒有模式的對話框<br>"                        + "你可以使用更多的格式<br>"                        + "甚至可以使用主窗體！");                    label.setHorizontalAlignment(JLabel.CENTER);                    Font font = label.getFont();                                        label.setFont(label.getFont().deriveFont(font.PLAIN,                                                             14.0f));                    JButton closeButton = new JButton("關閉");                    closeButton.addActionListener(new ActionListener() {                        public void actionPerformed(ActionEvent e) {                            dialog.setVisible(false);                            dialog.dispose();                        }                    });                    JPanel closePanel = new JPanel();                    closePanel.setLayout(new BoxLayout(closePanel,                                                       BoxLayout.LINE_AXIS));                    closePanel.add(Box.createHorizontalGlue());                    closePanel.add(closeButton);                    closePanel.setBorder(BorderFactory.                        createEmptyBorder(0,0,5,5));                    JPanel contentPane = new JPanel(new BorderLayout());                    contentPane.add(label, BorderLayout.CENTER);                    contentPane.add(closePanel, BorderLayout.PAGE_END);                    contentPane.setOpaque(true);                    dialog.setContentPane(contentPane);                    //顯示窗體                    dialog.setSize(new Dimension(300, 150));                    dialog.setLocationRelativeTo(frame);                    dialog.setVisible(true);                }            }        });        return createPane(moreDialogDesc + ":",                          radioButtons,                          showItButton);    }    public static void main(String[] args) {        JFrame.setDefaultLookAndFeelDecorated(true);        JDialog.setDefaultLookAndFeelDecorated(true);        //創建和設置一個窗體        JFrame frame = new JFrame("DialogDemo");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //設置一個面板        Container contentPane = frame.getContentPane();        contentPane.setLayout(new GridLayout(1,1));        contentPane.add(new DialogDemo(frame));        //顯示窗體        frame.pack();        frame.setVisible(true);    }}