add password validation servise

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

@@ -1,3 +1,10 @@
 package core.basesyntax;
 
+import java.util.concurrent.ExecutionException;
+
+class PasswordValidationException extends Exception {
+    PasswordValidationException(String message) {
+        super(message);
+    }
+}
 //write your code here

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

@@ -1,7 +1,16 @@
 package core.basesyntax;
 
+import java.io.IOException;
+
 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("Password and repeat password cannot be null");
+        }
+        if (password.length() < 10 || !password.equals(repeatPassword)) {
+            throw new PasswordValidationException("Wrong passwords");
+        }
     }
 }

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

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