Plz help to add new window on current one!

[Ishrat Hasan]

Here's my code snippet -

 public class ChatClient extends JFrame implements Serializable{
  ChatClient()
{
super("Chat");
cc=this;
   JMenuBar bar = new JMenuBar();
setJMenuBar(bar);
cntr = getContentPane();
 cntr.setLayout( new FlowLayout());
              
desktop = new JDesktopPane();
cntr.add( desktop );
rs = new ReadServer(this);
JMenu loginMenu = new JMenu( "Login");
loginMenu.setMnemonic( 'L');
JMenuItem loginItem = new JMenuItem( "Login...");
loginItem.setMnemonic( 'o' );
loginItem.addActionListener( new ActionListener(){
public void actionPerformed( ActionEvent e){
login();     
   }
  }
);
loginMenu.add(loginItem);
setSize(300,400);
show();
 }
//Method for new login window
void login(){
JInternalFrame intframe = new JInternalFrame("Login",true,true,true,true);
Container lcntr = intframe.getContentPane();
lcntr.setLayout( new FlowLayout() );
    JPanel panel = new JPanel();
panel.setLayout(new FlowLayout(FlowLayout.CENTER, 34, 44));
logID = new JLabel("LoginID");
panel.add(logID);
login = new JTextField(23);
panel.add(login);
lpswd = new JLabel("Password");
panel.add(lpswd);
pswd = new JPasswordField(20);
panel.add(pswd);
ok = new JButton(" OK ");
cancel = new JButton("Cancel");
panel.add(ok);
panel.add(cancel);
   ok.addActionListener( new ActionListener(){
public void actionPerformed( ActionEvent e){
  String log = login.getText();
   String pwd = pswd.getText();
   if ( !(log.equals("") || pwd.equals("")) ) {
      String message = "#L"+log + "+" + pwd;
   try{
System.out.println("writing: "+message);
out.writeObject(message);
 }catch(IOException ioe){ ioe.printStackTrace();} 
   }
   else {
    JOptionPane.showMessageDialog( null, "Please fill both Login and Password.");
}
  }
      }
       );
cancel.addActionListener( new ActionListener(){
public void actionPerformed( ActionEvent e ){
   String message = "close";
    try{
System.out.println("writing: "+message);
out.writeObject(message);
 }catch(IOException ioe){ ioe.printStackTrace();} 
   System.exit(0);  }
   }
 );

   lcntr.add(panel);
intframe.setOpaque(true);
desktop.add( intframe );
   setSize(325,150);
show();
}
public static void main(String args[]){
    final ChatClient2 app = new ChatClient2();
app.addWindowListener( new WindowAdapter(){
public void windowClosing( WindowEvent e){
System.exit(0);
   }
}
    );
  }
}