title: How to make my main Login frame stay alive when the second frame exiting?
body: <pre><code>package Project;
  import java.awt.*;
  import java.awt.event.*;
  
  import javax.swing.*;
  
   class mydlg extends JDialog
  {
      JButton b1,b2;
      JLabel f1;
      public mydlg(JFrame f,String t,boolean b)
      {
          super(f,t,b);
          Container con=getContentPane();
          con.setLayout(new FlowLayout());
          b1=new JButton(new ImageIcon("images/diamond.gif"));
          f1=new JLabel("Oops!!! You Must Enter the correct Password.");
          b2=new JButton("OK");
          con.setLocation(250, 250);
          con.add(b1);
          con.add(f1);
          con.add(b2);
          f.setDefaultCloseOperation(HIDE_ON_CLOSE);
          b2.setSize(250,250);
          setDefaultCloseOperation(DISPOSE_ON_CLOSE);
          con.setBackground(Color.orange);    
          setDefaultCloseOperation(DISPOSE_ON_CLOSE);
          b2.addActionListener(new ActionListener() {
              public void actionPerformed(ActionEvent e)
              {
                  System.exit(0);
  
              }
     });
      }
  }
  
  
  public class Login extends JFrame implements ActionListener{
  String str;
  JTextField lt;
  TextField pt;
  JButton ba;
  JLabel ll,pl,jb1;
  public Login() throws Exception
  {
  Container con=getContentPane();
  con.setLayout(new FlowLayout());
          jb1=new JLabel(new ImageIcon("images/login1.jpg"));
          con.add(jb1);   
  con.setBackground(Color.cyan);
  //con.setSize(1300, 1400);
  lt=new JTextField(20);
  pt=new TextField(20);
  pt.setEchoChar('*');
  ll=new JLabel("Username:");
  pl=new JLabel("Password:");
  lt.setText("Admin");
  ba=new JButton("LOGIN");
          ll.setBounds(45,80,150,30);
          lt.setBounds(140,80,150,30);
          pl.setBounds(45,140,150,30);
          pt.setBounds(140,140,150,30);
          ba.setBounds(140,200,90,30);
  
  con.add(ll);
  con.add(lt);
  con.add(pl);
  con.add(pt);
  con.add(ba);
  ba.addActionListener(this);
  setDefaultCloseOperation(DISPOSE_ON_CLOSE);
  }
  public void actionPerformed(ActionEvent ae){
      try{
  
          if(ae.getSource()==ba){
          if(pt.getText().equals("TDJSS")){
          new PrjtMain();
          //rm.setSize(700,700);
          //rm.setVisible(true);
  
                  }
          else{
          mydlg md=new mydlg(this,"Error Login Message",false);
          md.setSize(300,200);
          md.setLocationRelativeTo( null );
          md.setVisible(true);
          String cmd = ae.getActionCommand();
          if(cmd.equals("OK"))
          {
          System.exit(0);
          }
          }             
          }
  
         }catch(Exception ex){}
  }
  
  public static void main(String arg[])throws Exception
  {
  Login l=new Login();
  l.setSize(350,350);
  l.setLocationRelativeTo( null );
  l.setTitle("LOGIN");
  l.setVisible(true);
  }
  }
  </code></pre>
  
  <p>Hai.... I am successfully running this code.But When i Click The login button without enter the password, It showing an error message. After that When i click the "OK" button, both frames are closing at the same time. I want to make the main login page to be stay.. Please help me.. Thanks in advance. </p>