Configuration of Module

Create module.xml file at app/code/Magemonkeys/RewriteProduct/etc and add the following code inside this file:

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
<module name="Magemonkeys_RewriteProduct" setup_version="1.0.1">
</module>
</config>

Registration of Module

Create registration.php file at app/code/Magemonkeys/RewriteProduct and add the following code inside this file:

<?php

MagentoFrameworkComponentComponentRegistrar::register(
MagentoFrameworkComponentComponentRegistrar::MODULE,
'Magemonkeys_RewriteProduct',
__DIR__
);

Override di.xml

Create di.xml file at app/code/Magemonkeys/RewriteProduct/etc in order to specify which model to override by using <preference for=””>  and <preference type=””>.

Add the following code inside dl.xml file: The purpose of creating this file is to override di.xml file

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<preference for="MagentoCatalogModelProduct" type="MagemonkeysRewriteProductModelCatalogProduct" />
</config>

Override Product.php

Now, create Product.php file at app/code/Magemonkeys/RewriteProduct/Model/Catalog and add the following code in this file.

<?php

namespace MagemonkeysRewriteProductModelCatalog;

class Product extends MagentoCatalogModelProduct

{
   public function getName()
   {
       return $this->_getData(self::NAME) . ' + Override Model - Name';
   }

public function getSku()
   {
       return "123-Override Model - Sku";
   }
}

Launch SSH and Run Commands

Run the following commands in the Magento 2 root directory:

php bin/magento module:enable Magemonkeys_RewriteProduct
php bin/magento setup:upgrade
php bin/magento setup:di:compile
php bin/magento cache:clean
php bin/magento cache:flush

Now, it’s time to check the result!

Go to the product page and you should see as below: