add checked exception for validation passwords

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

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

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

@@ -1,7 +1,18 @@
 package core.basesyntax;
 
 public class PasswordValidator {
-    public void validate(String password, String repeatPassword) {
+    public void validate(String password, String repeatPassword)
+            throws PasswordValidationException {
+        PasswordValidationException exception = new PasswordValidationException("Wrong passwords");
         //write your code here
+        if (password == null || repeatPassword == null) {
+            throw exception;
+        }
+        if (password.length() < 10 && repeatPassword.length() < 10) {
+            throw exception;
+        }
+        if (!password.equals(repeatPassword)) {
+            throw exception;
+        }
     }
 }

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

@@ -1,8 +1,17 @@
 package core.basesyntax;
 
 public class UserService {
+    private PasswordValidator passwordValidator = new PasswordValidator();
+
     public void registerUser(User user) {
         //write your code here
+        try {
+            passwordValidator.validate(user.getPassword(), user.getRepeatPassword());
+        } catch (PasswordValidationException e) {
+            System.out.println("Your passwords are incorrect. Try again.");
+            return;
+        }
+        saveUser(user);
     }
 
     public void saveUser(User user) {