Magento 2 How to Override Core Block, Model and controller

Magento 2 How to Override Core Block, Model and controller

Create di.xml file at app/code/{Vendor}/{Module}/etc/di.xml

<?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="Magento\Catalog\Controller\Product\View" type="{Vendor}\{Module}\Controller\Catalog\Product\View" />
</config>

Create File View.php at app/code/{Vendor}/{Module}/Controller/Catalog/Product/

<?php

namespace Vendor\Module\Controller\Catalog\Product;
class View extends \Magento\Catalog\Controller\Product\View
{
    public function execute(){
        echo 'Hello Called from Overriden File '.__DIR_;exit;
    }
}

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