Made it so pressing enter on the keyboard activates the login and ok button

src/main/java/LoginGUI.java

@@ -2,6 +2,8 @@ import javax.swing.*;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.util.List;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
 
 public class LoginGUI extends JFrame implements ActionListener {
     private JTextField usernameField;
@@ -35,22 +37,26 @@ public class LoginGUI extends JFrame implements ActionListener {
         loginButton.addActionListener(this);
         add(loginButton);
         
+        getRootPane().setDefaultButton(loginButton);
+        
     }
 
     @Override
     public void actionPerformed(ActionEvent e) {
-    	if (e.getSource() == loginButton) {
-            String username = usernameField.getText();
-            String password = new String(passwordField.getPassword());
+        if (e.getSource() == loginButton) {
+            login();
+        }
+    }
 
-            if (authenticateUser(username, password)) {
+    private void login() {
+        String username = usernameField.getText();
+        String password = new String(passwordField.getPassword());
+
+        if (authenticateUser(username, password)) {
             JOptionPane.showMessageDialog(this, "Login successful!");
             // Perform actions after successful login
-            } else {
+        } else {
             JOptionPane.showMessageDialog(this, "Invalid username or password", "Login Error", JOptionPane.ERROR_MESSAGE);
-            }
-                
-            
         }
     }
     
@@ -68,6 +74,21 @@ public class LoginGUI extends JFrame implements ActionListener {
     }
 
 
+    private class EnterKeyListener implements KeyListener {
+        @Override
+        public void keyTyped(KeyEvent e) {}
+
+        @Override
+        public void keyPressed(KeyEvent e) {
+            if (e.getKeyCode() == KeyEvent.VK_ENTER) {
+                login();
+            }
+        }
+
+        @Override
+        public void keyReleased(KeyEvent e) {}
+    }
+    
     public static void main(String[] args) {
         SwingUtilities.invokeLater(() -> {
             LoginGUI loginGUI = new LoginGUI();