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copied!<p>The simplest dialog box you can create and display with the javax.swing.JOptionPane class is the message dialog box. This can be done with the static method: showMessageDialog(frame, message, title, type), where:</p> <ol> <li>"frame" is a frame object to be used as the parent frame.</li> <li>"message" is the message string to be display on the dialog box. 3."title" is the title string to be used as the dialog box title.</li> <li>"type" is an integer code representing a specific message dialog box type. Valid type codes are predefined as constants in the JOptionPane class: INFORMATION_MESSAGE, WARNING_MESSAGE, ERROR_MESSAGE and PLAIN_MESSAGE.</li> </ol> <p><strong>Here is an example program</strong></p> <pre><code>import java.awt.event.*; import javax.swing.*; import javax.swing.event.*; public class JOptionPaneShowMessageDialog implements ActionListener { JFrame myFrame = null; public static void main(String[] a) { (new JOptionPaneShowMessageDialog()).test(); } private void test() { myFrame = new JFrame("showMessageDialog Test"); myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); myFrame.setBounds(50,50,250,150); myFrame.setContentPane(new JDesktopPane()); JMenuBar myMenuBar = new JMenuBar(); JMenu myMenu = getDialogMenu(); myMenuBar.add(myMenu); myFrame.setJMenuBar(myMenuBar); myFrame.setVisible(true); } private JMenu getDialogMenu() { JMenu myMenu = new JMenu("Dialogs"); JMenuItem myItem = new JMenuItem("Information"); myItem.addActionListener(this); myMenu.add(myItem); myItem = new JMenuItem("Warning"); myItem.addActionListener(this); myMenu.add(myItem); myItem = new JMenuItem("Error"); myItem.addActionListener(this); myMenu.add(myItem); myItem = new JMenuItem("Plain"); myItem.addActionListener(this); myMenu.add(myItem); return myMenu; } public void actionPerformed(ActionEvent e) { String menuText = ((JMenuItem) e.getSource()).getText(); int messageType = JOptionPane.INFORMATION_MESSAGE; if (menuText.equals("Information")) { messageType = JOptionPane.INFORMATION_MESSAGE; } else if (menuText.equals("Warning")) { messageType = JOptionPane.WARNING_MESSAGE; } else if (menuText.equals("Error")) { messageType = JOptionPane.ERROR_MESSAGE; } else if (menuText.equals("Plain")) { messageType = JOptionPane.PLAIN_MESSAGE; } System.out.println("Before displaying the dialog: "+menuText); JOptionPane.showMessageDialog(myFrame, "This is message dialog box of type: "+menuText, menuText+" Message", messageType); System.out.println("After displaying the dialog: "+menuText); } } </code></pre>

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