JDialog Problem: How to make a simple "About" dialog box?

Question

Hi, anyone can try me out the problem, how to make a simple "About" dialog box? I try to click on the MenuBar item, then request it display a JDialog, how? Following is my example code, what wrong code inside?
** Main.java**
============================
publc class Main extends JFrame{
public Main() {
          super();
          setJMenuBar();
          initialize();
public void setJMenuBar()
     JMenuBar menubar = new JMenuBar();
        setJMenuBar(menubar);
        JMenu menu1 = new JMenu("File");      
        JMenuItem item = new JMenuItem("About");      
        item.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
              // About about = new About(this);
           // about.show();
        menu1.add(item);
     menubar.add(menu1);
public static void main(String args[]){
     Main main = new Main();
}** About.java**
=============================
import java.awt.*;
import javax.swing.*;
public class About extends JDialog{
     JPanel jp_top, jp_center, jp_bottom;
     public About(JFrame owner){
          super(owner);
          setDefaultCloseOperation( DISPOSE_ON_CLOSE );
          Image img = Toolkit.getDefaultToolkit().getImage(DateChooser.class.getResource("Duke.gif"));          
          setIconImage( img );
          setSize(500,800);
          Container contentPane = getContentPane();
         contentPane.setLayout(new BorderLayout());           
         contentPane.add(getTop(), BorderLayout.NORTH);
          contentPane.add(getCenter(), BorderLayout.CENTER);
          contentPane.add(getBottom(), BorderLayout.SOUTH);
          setResizable(false);
           pack();            
           setVisible(true);
     public JPanel getTop(){
          jp_top = new JPanel();
          return jp_top;
     public JPanel getCenter(){
          jp_center = new JPanel();
          return jp_center;
     public JPanel getBottom(){
          jp_bottom = new JPanel();
          jp_bottom.setLayout(new BoxLayout(jp_bottom, BoxLayout.X_AXIS));
          JButton jb = new JButton("OK");
          jp_bottom.add(jb);
          return jp_bottom;
}

Answer 1

Code looks reasonable except
a) the code in the actionPerformed is commment out
b) the owner of the dialog should be the frame
If you need further help then you need to create a "Short, Self Contained, Compilable and Executable, Example Program (SSCCE)",
see http://homepage1.nifty.com/algafield/sscce.html,
that demonstrates the incorrect behaviour, because I can't guess exactly what you are doing based on the information provided.