How to get product name in Magento 2?

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$objectManager = MagentoFrameworkAppObjectManager::getInstance();
$product = $objectManager->get('MagentoCatalogModelProduct')->load($productId);
$productName = $product->getName();

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use MagentoCatalogApiProductRepositoryInterface;

...

public function __construct(
    ProductRepositoryInterface $productRepository
) {
    $this->productRepository = $productRepository;
}

...

$product = $this->productRepository->getById($productId);
$productName = $product->getName();