refactoring: stayLoggedInCheckbox listener in LoginGUI

src/main/java/LoginGUI.java

@@ -75,17 +75,14 @@ public class LoginGUI extends JFrame implements ActionListener {
         
         passwordField.addKeyListener(new EnterKeyListener());
         
-        stayLoggedInCheckbox.addActionListener(new ActionListener() {
-            @Override
-            public void actionPerformed(ActionEvent e) {
-                boolean stayLoggedIn = stayLoggedInCheckbox.isSelected();
-                String username = usernameField.getText();
-                // Set stayLoggedIn to false if the checkbox is unchecked
-                if (!stayLoggedInCheckbox.isSelected()) {
-                	stayLoggedIn = false;
-                }
-                updateStayLoggedIn(username, stayLoggedIn);
+        stayLoggedInCheckbox.addActionListener(e -> {
+            boolean stayLoggedIn = stayLoggedInCheckbox.isSelected();
+            String username = usernameField.getText();
+            // Set stayLoggedIn to false if the checkbox is unchecked
+            if (!stayLoggedInCheckbox.isSelected()) {
+                stayLoggedIn = false;
             }
+            updateStayLoggedIn(username, stayLoggedIn);
         });
         
     }

user.json

@@ -1,2 +1 @@
-[
-]
+[]