implemented methods registerUser(), validate().

README.md

@@ -8,7 +8,12 @@ We should implement the following methods:
 - `registerUser()` in UserService class
 - `validate()` in PasswordValidator class
 
-Method `validate()` should compare the `password` field with the `repeatPassword` field and check if their length is more or equal to 10. If not, throw exception `PasswordValidationException` with the message "Wrong passwords" (since it's our custom logic, let's create our own, **CHECKED**, exception because the user can put any password and our service shouldn't be broken. We should handle the not-valid case and return the understandable message).
+Method `validate()` should compare the `password` field with the `repeatPassword` 
+field and check if their length is more or equal to 10. If not, throw exception 
+`PasswordValidationException` with the message "Wrong passwords" (since it's our 
+custom logic, let's create our own, **CHECKED**, exception because the user can put 
+any password and our service shouldn't be broken. We should handle the not-valid case 
+and return the understandable message).
 
 Method `registerUser()` should call the method `validate()` and handle the exception.
 If everything is okay, save the user to the database (use method `saveUser()`),

src/main/java/core/basesyntax/PasswordValidationException.java

@@ -1,3 +1,8 @@
 package core.basesyntax;
 
 //write your code here
+public class PasswordValidationException extends Exception {
+    public PasswordValidationException(String message) {
+        super(message);
+    }
+}

src/main/java/core/basesyntax/PasswordValidator.java

@@ -1,7 +1,14 @@
 package core.basesyntax;
 
 public class PasswordValidator {
-    public void validate(String password, String repeatPassword) {
+    public void validate(String password, String repeatPassword)
+            throws PasswordValidationException {
         //write your code here
+        if (password == null || repeatPassword == null) {
+            throw new PasswordValidationException("Passwords cannot be null");
+        }
+        if (!(password.equals(repeatPassword) && password.length() >= 10)) {
+            throw new PasswordValidationException("Wrong passwords");
+        }
     }
 }

src/main/java/core/basesyntax/UserService.java

@@ -3,6 +3,14 @@
 public class UserService {
     public void registerUser(User user) {
         //write your code here
+        PasswordValidator passwordValidator = new PasswordValidator();
+        try {
+            passwordValidator.validate(user.getPassword(), user.getRepeatPassword());
+            saveUser(user);
+        } catch (PasswordValidationException e) {
+            System.out.println("Your passwords are incorrect. Try again.");
+        }
+
     }
 
     public void saveUser(User user) {