the code has been improved in terms of writing rules

src/main/java/mate/academy/Main.java

@@ -11,6 +11,7 @@ public static void main(String[] args) {
         test("[email protected]", "1234", false);
         test("[email protected]", "qwerty", false);
     }
+
     private static void test(String email, String password, boolean expected) {
         boolean actual = authenticationService.login(email, password);
 

src/main/java/mate/academy/service/AuthenticationService.java

@@ -4,6 +4,7 @@
 
 public class AuthenticationService {
     private final UserService userService = new UserService();
+
     /**
      * Imagine that some user wants to login to your site.
      * You should check if user credentials (login and password) are valid or not.
@@ -17,14 +18,8 @@ public boolean login(String email, String password) {
         User user = userService.findByEmail(email);
 
         if (user != null) {
-
-
-            if (!user.getPassword().equals(password)) {
-                return false;
-            } else {
-                return true;
-            }
+            return user.getPassword().equals(password);
         }
-        return user != null && user.getPassword().equals(password);
+        return false;
     }
 }

src/main/java/mate/academy/service/UserService.java

@@ -2,8 +2,6 @@
 
 import mate.academy.model.User;
 
-import java.util.Scanner;
-
 public class UserService {
     private static final User[] users = new User[] {
             new User("[email protected]", "1234"),
@@ -16,7 +14,6 @@ public class UserService {
      * @return - user if his email is equal to passed email.
      * Return <code>null</code> if there is no suitable user
      */
-
     public User findByEmail(String email) {
         for (User user : users) { // Для отладки
             if (user.getEmail().equals(email)) {