Magento - call custom class's method from script

Question

I am trying to call a method from a class, but its not working

namespace Vendor\RetailOps\Service;

/**
 * Shipment class.
 *
 */
abstract class Shipment implements \Vendor\RetailOps\Api\Shipment\ShipmentInterface
{
   /**
     * @param $order
     */
    public function createShipment(\Magento\Sales\Api\Data\OrderInterface $order)
    {
        echo'check'; exit;
    }

    use Magento\Framework\App\Bootstrap;
    require __DIR__ . '/../app/bootstrap.php';
    $bootstrap     = Bootstrap::create(BP, $_SERVER);
    $objectManager = $bootstrap->getObjectManager();
    $state         = $objectManager->get('Magento\Framework\App\State');
    $state->setAreaCode('frontend');
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $orderid = 940;
    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
    $order = $objectManager->create('Magento\Sales\Api\Data\OrderInterface')->load($orderid);
    echo  $objectManager->create('Vendor\RetailOps\Service\Shipment')->createShipment($order);

Answer 1

Modify your class like this one.

namespace Vendor\RetailOps\Service;

class Shipment implements \Vendor\RetailOps\Api\Shipment\ShipmentInterface
{
    public function createShipment(\Magento\Sales\Api\Data\OrderInterface $order)
    {
            echo'check'; exit;
    }
}