package messagedialog;import java.awt.*;import java.awt.event.*;import javax.swing.*;/** * <p>Title: Message Dialog Demo</p> * <p>Description: This is a MessageDialog demo</p> * <p>Copyright: Copyright (c) 2002</p> * <p>Company: d6-125</p> * @author Liujun * @version 1.0 */public class MessageDialogFrame extends JFrame {  JPanel contentPane;  JButton jButton1 = new JButton();  GridBagLayout gridBagLayout1 = new GridBagLayout();  ButtonGroup buttonGroup1 = new ButtonGroup();  ButtonGroup buttonGroup2 = new ButtonGroup();  JRadioButton jRadioButton1 = new JRadioButton();  JRadioButton jRadioButton2 = new JRadioButton();  JRadioButton jRadioButton3 = new JRadioButton();  JRadioButton jRadioButton4 = new JRadioButton();  JRadioButton jRadioButton5 = new JRadioButton();  JRadioButton jRadioButton6 = new JRadioButton();  JRadioButton jRadioButton7 = new JRadioButton();  JRadioButton jRadioButton8 = new JRadioButton();  JRadioButton jRadioButton9 = new JRadioButton();  JLabel jLabel1 = new JLabel();  JLabel jLabel2 = new JLabel();  JRadioButton jRadioButton10 = new JRadioButton();   //定義的私有變量   String Title=null;//對話框標題   private String messageString = "Message";//字符串消息對象   private Icon messageIcon //圖標消息對象      = new ImageIcon("001.gif");   private Font messageFont//Font消息對象      = new Font("Serif", Font.PLAIN, 8);   private Component messageComponent//組件消息對象      = new JPanel()         {  public void paintComponent(Graphics g)            {  super.paintComponent(g);               g.setFont(messageFont);               g.drawString("Component", 0, 8);            }            public Dimension getMinimumSize()            {  return new Dimension(12, 30);            }         }; //Construct the frame  public MessageDialogFrame() {    enableEvents(AWTEvent.WINDOW_EVENT_MASK);    try {      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  //Component initialization  private void jbInit() throws Exception  {    //setIconImage(Toolkit.getDefaultToolkit().createImage(MessageDialogFrame.class.getResource("[Your Icon]")));    contentPane = (JPanel) this.getContentPane();    contentPane.setLayout(gridBagLayout1);    this.setSize(new Dimension(336, 249));    this.setTitle("Message Dialog Frame Demo");    jButton1.setText("顯示消息框");    jButton1.addActionListener(new java.awt.event.ActionListener() {      public void actionPerformed(ActionEvent e) {        jButton1_actionPerformed(e);      }    });    contentPane.setBorder(BorderFactory.createRaisedBevelBorder());    jRadioButton1.setText("ERROR_MESSAGE");    jRadioButton2.setText("INFORMATION_MESSAGE");    jRadioButton3.setText("WARNING_MESSAGE");    jRadioButton4.setText("QUESTION_MESSAGE");    jRadioButton5.setText("PLAIN_MESSAGE");    jRadioButton6.setText("String");    jRadioButton7.setText("Icon");    jRadioButton8.setText("Component");    jRadioButton9.setText("Other");    jLabel1.setText("各種消息類型");    jLabel2.setText("消息");    jRadioButton10.setText("Object[]");    contentPane.add(jButton1,                  new GridBagConstraints(0, 0, 2, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 80, -6));    contentPane.add(jRadioButton1,       new GridBagConstraints(0, 2, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton2,       new GridBagConstraints(0, 3, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton3,       new GridBagConstraints(0, 4, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton4,       new GridBagConstraints(0, 5, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton5,       new GridBagConstraints(0, 6, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.BOTH, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton6,     new GridBagConstraints(1, 2, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton7,     new GridBagConstraints(1, 3, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton9,     new GridBagConstraints(1, 5, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));    buttonGroup1.add(jRadioButton1);    buttonGroup1.add(jRadioButton2);    buttonGroup1.add(jRadioButton3);    buttonGroup1.add(jRadioButton4);    buttonGroup1.add(jRadioButton5);    buttonGroup2.add(jRadioButton6);    buttonGroup2.add(jRadioButton7);    buttonGroup2.add(jRadioButton8);    buttonGroup2.add(jRadioButton9);    buttonGroup2.add(jRadioButton10);    contentPane.add(jLabel2,  new GridBagConstraints(1, 1, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jLabel1,  new GridBagConstraints(0, 1, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton10,   new GridBagConstraints(1, 6, 1, 1, 0.0, 0.0            ,GridBagConstraints.CENTER, GridBagConstraints.HORIZONTAL, new Insets(0, 0, 0, 0), 0, 0));    contentPane.add(jRadioButton8,  new GridBagConstraints(1, 4, 1, 1, 0.0, 0.0            ,GridBagConstraints.NORTH, GridBagConstraints.HORIZONTAL, new Insets(-5, 0, 5, 0), 0, 0));  }  //Overridden so we can exit when window is closed  protected void processWindowEvent(WindowEvent e) {    super.processWindowEvent(e);    if (e.getID() == WindowEvent.WINDOW_CLOSING) {      System.exit(0);    }  }  public Object getMessage()   {  //用于得到消息對象      if (jRadioButton6.isSelected())         return messageString;//返回字符串消息對象      else if (jRadioButton7.isSelected())         return messageIcon;//返回圖標消息對象      else if (jRadioButton8.isSelected())         return messageComponent;//返回組件消息對象      else if (jRadioButton10.isSelected())         return new Object[]//返回新建立一個混合對象         {  messageString,            messageIcon,            messageComponent,            messageFont         };      else if (jRadioButton9.isSelected())         return messageFont;//返回Font消息對象      else return null;   }   public int getType()   {    String s=null;    if (jRadioButton1.isSelected()){         s ="ERROR_MESSAGE";//設置消息類型         Title="－－－有錯誤";//設置標題         }      else if (jRadioButton2.isSelected()){          s ="INFORMATION_MESSAGE";//設置消息類型         Title="－－－是提醒消息";//設置標題         }      else if (jRadioButton3.isSelected()){          s ="WARNING_MESSAGE";//設置消息類型         Title="－－－警告消息";//設置標題         }      else if (jRadioButton4.isSelected()){          s ="QUESTION_MESSAGE";//設置消息類型         Title="－－－是一個問題";//設置標題         }      else if(jRadioButton5.isSelected()){          s ="PLAIN_MESSAGE";//設置消息類型         Title="－－－一般的消息";//設置標題        }      try      {  Class cl = JOptionPane.class;//得到對話框類型         return cl.getField(s).getInt(cl);//根據消息類型返回類型代碼      }      catch(Exception e)      {  return -1;      }   }  void jButton1_actionPerformed(ActionEvent e) {     int Type=getType();//返回消息類型碼，顯示消息對話框         JOptionPane.showMessageDialog(this,            getMessage(),            "消息框演示"+Title,            Type);  }}