How to create a login system in Java NetBeans

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This is a Java Tutorial for beginners in which I have shown how to Design a custom Login Form with Java using Netbeans IDE ,
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if you are not understood then you are follow to code:
package login2;

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


public class Login2 {


public static void main(String[] args) {
Frame f = new Frame();
JLabel l1 = new JLabel("Username:");
JLabel l2 = new JLabel("Password:");
JTextField tf1 = new JTextField();
JPasswordField pas = new JPasswordField();
JButton sub = new JButton("Submit");
JButton ret = new JButton("Reset");
JButton ext = new JButton("Exit");
ext.setBounds(260, 150, 80, 40);
sub.setBounds(70, 150, 80, 40);
ret.setBounds(160, 150, 80, 40);
tf1.setBounds(90, 40, 120, 40);
pas.setBounds(90, 90, 120, 40);
l1.setBounds(10, 40, 80, 40);
l2.setBounds(10, 90, 80, 40);
f.add(l1);
f.add(l2);
f.add(sub);
f.add(tf1);
f.add(ret);
f.add(ext);
f.add(pas);
f.setLayout(null);
f.setSize(700, 800);
f.setVisible(true);
ret.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
tf1.setText("");
pas.setText("");
}
});
sub.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e1) {
String value = tf1.getText();
String pwd = pas.getText();
if (value.equals("suraj") && pwd.equals("123")) {
JOptionPane.showMessageDialog(f, "Sucessfully Login");

} else {
JOptionPane.showMessageDialog(f, "Invalid useid & password");
}
}
});
ext.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e2) {
System.exit(0);
}
});
}

}