A simple login program using swing in Java programming language.

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Program Listing
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JOptionPane;

/**
 *
 * Simple Login Using Swing in Java
 *
 * @version 1.0 from 09/07/2022
 * @Jake Pomperada
 */

public class LoginDemo extends JFrame {
  /**
	 * 
	 */
	private static final long serialVersionUID = 1L;
// start attributes
  private JLabel lblUsername = new JLabel();
  private JLabel lblPassword = new JLabel();
  private JTextField txtUSername = new JTextField();
  private JTextField txtPassword = new JTextField();
  private JButton bOK = new JButton();
  private JButton btnCancel = new JButton();
  // end attributes
  
  public LoginDemo() { 
    // Frame-Init
    super();
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
    int frameWidth = 289; 
    int frameHeight = 205;
    setSize(frameWidth, frameHeight);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    int x = (d.width - getSize().width) / 2;
    int y = (d.height - getSize().height) / 2;
    setLocation(x, y);
    setTitle("LoginDemo");
    setResizable(false);
    Container cp = getContentPane();
    cp.setLayout(null);
    // start components
    btnCancel.setBounds(184, 120, 83, 25);
    btnCancel.setText("Cancel");
    btnCancel.setMargin(new Insets(2, 2, 2, 2));
    btnCancel.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent evt) { 
        btnCancel_ActionPerformed(evt);
      }
    });
    btnCancel.setMnemonic(KeyEvent.VK_A);
    cp.add(btnCancel);
    bOK.setBounds(104, 120, 75, 25);
    bOK.setText("OK");
    bOK.setMargin(new Insets(2, 2, 2, 2));
    bOK.addActionListener(new ActionListener() { 
      public void actionPerformed(ActionEvent evt) { 
        bOK_ActionPerformed(evt);
      }
    });
    cp.add(bOK);
    txtUSername.setBounds(104, 24, 161, 25);
    cp.add(txtUSername);
    lblUsername.setBounds(8, 24, 89, 25);
    lblUsername.setText("Username");
    cp.add(lblUsername);
    
    lblPassword.setBounds(8, 72, 89, 25);
    lblPassword.setText("Password");
    cp.add(lblPassword);
    txtPassword.setBounds(104, 72, 161, 25);
    cp.add(txtPassword);
    // end components
    
    setVisible(true);
  }
  
  // start methods
  
  public static void main(String[] args) {
    new LoginDemo();
  }
  public void bOK_ActionPerformed(ActionEvent evt) {
    String userName = txtUSername.getText();
    String passWord = txtPassword.getText();
    
    if(userName.equals("admin") && passWord.equals("123"))
      JOptionPane.showMessageDialog(this, "Login successful");
    else {
      JOptionPane.showMessageDialog(this, "Login failed");
    }
    
  }

  public void btnCancel_ActionPerformed(ActionEvent evt) {
    System.exit(0);
  }
}

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