refactoring: stayLoggedInCheckbox listener in LoginGUI

src/main/java/LoginGUI.java

@@ -75,9 +75,7 @@ public class LoginGUI extends JFrame implements ActionListener {
         
         passwordField.addKeyListener(new EnterKeyListener());
         
-        stayLoggedInCheckbox.addActionListener(new ActionListener() {
-            @Override
-            public void actionPerformed(ActionEvent e) {
+        stayLoggedInCheckbox.addActionListener(e -> {
             boolean stayLoggedIn = stayLoggedInCheckbox.isSelected();
             String username = usernameField.getText();
             // Set stayLoggedIn to false if the checkbox is unchecked
@@ -85,7 +83,6 @@ public class LoginGUI extends JFrame implements ActionListener {
                 stayLoggedIn = false;
             }
             updateStayLoggedIn(username, stayLoggedIn);
-            }
         });
         
     }

user.json

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