Simple Login Using Swing in Java

 A simple login program using swing in Java programming language.

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Program Listing

LoginDemo.java

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);

  }

}