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How do I override core files in app/code/Magento folder in Magento 2?

I want to change core functionality so I need to override core files in the app/code/Magento folder instead of directly changing that core files.

Core file:

vendor/magento/module-catalog-import-export/Model/Export/Product.php

Overriden at:

app/code/Magento/CatalogImportExport/Model/Export/Product.php

But it is not working. I don't know how to implement this task. Can you please help me?

You can override model using plugin features in Magento2

for that Create a custom module and in di.xml put code like below

<?xml version="1.0"?> 

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

    <type name="MagentoCatalogImportExportModelExportProduct">

        <plugin name="override-module-export-product" type="NimeshHelloWorldPluginExportProduct" sortOrder="1" />

    </type>

</config>

You can override model function using before, after & around method. In below example, We can override export function behavior using before and after method

Create class file like this
(app/code/Nimesh/HelloWorld/Plugin/Export/Product.php)

namespace Nimesh/HelloWorld/Plugin/Export;



class Product

{   



    public function beforeExport(MagentoCatalogImportExportModelExportProduct $product)

    {

        /******put your logic *******/            

    }





    public function afterExport(MagentoCatalogImportExportModelExportProduct $product)

    { 

        /********put your logic ********/   

    }



}

?>

Create simple module and override model file.

Step 1.

Create a di.xml file in a following directory Company/CatalogImportExport/etc/

<?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="MagentoCatalogImportExportModelExportProduct" type="CompanyCatalogImportExportModelMagentoCatalogImportExportExportProduct" />



</config>

Step 2

<?php



namespace CompanyCatalogImportExportModelMagentoCatalogImportExportExport;





class Product extends MagentoCatalogImportExportModelExportProduct

{

        public function __construct()

        {

            echo "Model Rewrite Working"; die();

        }

}

it can easy

1. Move/Copy to core module to - app/code/Magento/Wishlist
   


2. List item edit composer.json and add

"replace": {
"magento/module-wishlist": "*"
},

more info by link - https://www.integer-net.com/removing-unused-core-modules-from-magento-2-the-right-way/

3. run command SSH - composer update
   


4. run command SSH - php bin/magento setup:upgrade
   


5. check and remove module in vendor/magento/module-wishlist
   

Now, you can edit/remove logic of Magento standard modules

:)

You have to create one new module in that "code" folder and override that Model's Product.php in that module.