Login

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

public class Login{
    JTextField txtUsername = null;
    JTextField txtPassword = null;
    public static void main(String[] args){
        Login gui = new Login();
        gui.go();
    }

    public void go(){
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        txtUsername = new JTextField(20);
        txtPassword = new JTextField(20);

        JLabel lblUsername = new JLabel("Username:");
        JLabel lblPassword = new JLabel("Password:");

        JButton btnLogin = new JButton("Login");
        btnLogin.addActionListener(new LoginListener(this));
        JButton btnCancel = new JButton("Cancel");
        btnCancel.addActionListener(new CancelListener(this));

        panel.add(lblUsername);
        panel.add(txtUsername);
        panel.add(lblPassword);
        panel.add(txtPassword);

        panel.add(btnLogin);
        panel.add(btnCancel);
        frame.getContentPane().add(BorderLayout.CENTER,panel);

        frame.setSize(300,300);
        frame.setVisible(true);
    }

    public void sendMessage(String msg) {
        JOptionPane.showMessageDialog(null,msg);
    }

    public String getUsername() {
        return txtUsername.getText();
    }

    public String getPassword() {
        return txtPassword.getText();
    }

    public void clear() {
        txtUsername.setText("");
        txtPassword.setText("");
        txtUsername.requestFocus();
    }

    public class LoginListener implements ActionListener{
        String username = "admin";
        String password = "admin123";
        Login login;

        public LoginListener(Login login) {
            this.login = login;
        }

        public void actionPerformed(ActionEvent event){
            if(username.equals(login.getUsername()) && password.equals(login.getPassword())){
                login.sendMessage("Welcome Admin");
            }else{
                login.sendMessage("Login Failed");
            }
        }
    }
    public class CancelListener implements ActionListener{
        Login login;

        public CancelListener(Login login) {
            this.login = login;
        }

        public void actionPerformed(ActionEvent event){
            login.clear();
        }
    }
}