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);
}
}
