Inject user.data service

use Drupal\user\UserDataInterface;

/**
 * The user data service.
 */
protected UserDataInterface $userData;

/**
 * Constructs the object.
 *
 * @param \Drupal\user\UserDataInterface $user_data
 *   The user data service.
 */
public function __construct(UserDataInterface $user_data) {
 $this->userData = $user_data;
}

/**
 * {@inheritdoc}
 */
public static function createInstance(ContainerInterface $container) {
 return new static(
   $container->get('user.data'),
 );
}