My code is

<?php /**  * Copyright © Magento, Inc. All rights reserved.  * See COPYING.txt for license details.  */ namespace My\Module\Block; use Magento\Framework\View\Element\Template; class Abc extends Template {      protected $  _customerSession;      /**      * @param Template\Context $  context      */     public function __construct(     Template\Context $  context,     \Magento\Customer\Model\Session $  customerSession     )     {         parent::__construct($  context);         $  this->_customerSession = $  customerSession;      }      public function getCustomerDetail(){             if($  this->_customerSession->isLoggedIn()) {                 echo $  this->_customerSession->getCustomer()->getId();                 echo $  this->_customerSession->getCustomer()->getName();                 echo $  this->_customerSession->getCustomer()->getEmail();                 echo $  this->_customerSession->getCustomer()->getGroupId();               }         } }