Implemented a login method in AuthenticationService and findByEmail method in UserService

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

@@ -1,8 +1,9 @@
 package mate.academy.model;
 
 public class User {
-    private String email;
-    private String password;
+
+    private final String email;
+    private final String password;
 
     public User(String email, String password) {
         this.email = email;

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

@@ -1,16 +1,25 @@
 package mate.academy.service;
 
+import mate.academy.model.User;
+
 public class AuthenticationService {
+
     /**
-     * Imagine that some user wants to login to your site.
+     * 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.
      */
+
     public boolean login(String email, String password) {
-        return false;
+        User user = UserService.findByEmail(email);
+
+        if (user == null) {
+            return false;
+        }
+        return user.getPassword().equals(password);
     }
 }

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

@@ -3,6 +3,7 @@
 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")
@@ -14,7 +15,13 @@ 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) {
+
+    public static User findByEmail(String email) {
+        for (User person : users) {
+            if (person.getEmail().equals(email)) {
+                return person;
+            }
+        }
         return null;
     }
 }