求助 java awt 登陆界面

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class denglu extends javax.swing.JFrame {
private JPanel jPanel1;
private JButton bntLogin;
private JButton bntCannel;
private JPasswordField pwd;
private JTextField username;
private JLabel jLabel2;
private JLabel jLabel1;

public static void main(String[] args) {

   denglu inst = new denglu();
   inst.setLocationRelativeTo(null);
   inst.setVisible(true);

}

public denglu() {
   super();
   initGUI();
}

private void initGUI() {
   try {
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    {
     jPanel1 = new JPanel();
     getContentPane().add(jPanel1, BorderLayout.CENTER);
     jPanel1.setLayout(null);
     {
      jLabel1 = new JLabel();
      jPanel1.add(jLabel1);
      jLabel1.setText("用户名");
      jLabel1.setBounds(45, 30, 75, 25);
     }
     {
      jLabel2 = new JLabel();
      jPanel1.add(jLabel2);
      jLabel2.setText("密码");
      jLabel2.setBounds(45, 75, 55, 15);
     }
     {
      username = new JTextField();
      jPanel1.add(username);
      username.setBounds(100, 30, 140, 25);
     }
     {
      pwd = new JPasswordField();
      jPanel1.add(pwd);
      pwd.setBounds(100, 70, 140, 25);
     }
     {
      bntLogin = new JButton();
      jPanel1.add(bntLogin);
      bntLogin.setText("Ok");
      bntLogin.setBounds(80, 120, 60, 30);
      bntLogin.addMouseListener(new MouseAdapter() {
       public void mouseClicked(MouseEvent e) {
        if (username.getText().equals("1040610203")
          && pwd.getText().equals("1040610203")) {
         JOptionPane.showMessageDialog(denglu.this,
           "登录成功");
        } else {
         JOptionPane.showMessageDialog(denglu.this,
           "登录失败");
        }

       }
      });

      bntCannel = new JButton();
      jPanel1.add(bntCannel);
      bntCannel.setText("Exit");
      bntCannel.setBounds(160, 120, 60, 30);

      bntCannel.addMouseListener(new MouseAdapter() {
       public void mouseClicked(MouseEvent e) {

        System.exit(0);
       }
      });
     }
    }
    pack();
    setSize(300, 215);

   } catch (Exception e) {
    e.printStackTrace();
   }
}
}