implemented a login method

pom.xml

@@ -14,6 +14,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <maven.checkstyle.plugin.version>3.1.1</maven.checkstyle.plugin.version>
         <maven.checkstyle.plugin.configLocation>
+<!--            google_checks.xml-->
             https://raw.githubusercontent.com/mate-academy/style-guides/master/java/checkstyle.xml
         </maven.checkstyle.plugin.configLocation>
     </properties>

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

@@ -3,6 +3,7 @@
 import mate.academy.service.AuthenticationService;
 
 public class Main {
+
     private static final AuthenticationService authenticationService = new AuthenticationService();
 
     public static void main(String[] args) {

src/main/java/mate/academy/model/User.java

@@ -1,6 +1,7 @@
 package mate.academy.model;
 
 public class User {
+
     private String email;
     private String password;
 

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

@@ -1,16 +1,23 @@
 package mate.academy.service;
 
+import mate.academy.model.User;
+
 public class AuthenticationService {
+
     /**
-     * Imagine that some user wants to login to your site.
-     * You should check if user credentials (login and password) are valid or not.
-     * All users are stored in <code>UserService</code> class.
-     * @param email - user's email
+     * Imagine that some user wants to login to your site. You should check if user credentials
+     * (login and password) are valid or not. All users are stored in <code>UserService</code>
+     * class.
+     *
+     * @param email    - user's email
      * @param password - user's password
-     * @return true if user by email exists and passed password is equal to user's password.
-     * Return false in any other cases.
+     * @return true if user by email exists and passed password is equal to user's password. Return
+     * false in any other cases.
      */
     public boolean login(String email, String password) {
-        return false;
+        UserService userService = new UserService();
+        User user = userService.findByEmail(email);
+        return user != null && user.getPassword().equals(password);
     }
 }
+

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

@@ -3,18 +3,24 @@
 import mate.academy.model.User;
 
 public class UserService {
-    private static final User[] users = new User[] {
-            new User("[email protected]", "1234"),
-            new User("[email protected]", "1234")
-    };
+
+    private static final User[] users = new User[]{new User("[email protected]", "1234"),
+            new User("[email protected]", "1234")};
 
     /**
      * Find user by email. All users are stored in <code>private static final User[] users</code>
+     *
      * @param email - the input parameter
-     * @return - user if his email is equal to passed email.
-     * Return <code>null</code> if there is no suitable user
+     * @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) {
+            if (user.getEmail().equals(email)) {
+                return user;
+            }
+        }
         return null;
     }
 }