How to get Current Product & Current Category in Magento 2

<?php
namespace Mageplaza\HelloWorld\Block;
class HelloWorld extends \Magento\Framework\View\Element\Template
{
        protected $_registry;
        
    public function __construct(
        \Magento\Backend\Block\Template\Context $context,        
        \Magento\Framework\Registry $registry,
        array $data = []
    )
    {        
        $this->_registry = $registry;
        parent::__construct($context, $data);
    }
    
    public function _prepareLayout()
    {
        return parent::_prepareLayout();
    }
    
    public function getCurrentCategory()
    {        
        return $this->_registry->registry('current_category');
    }
    
    public function getCurrentProduct()
    {        
        return $this->_registry->registry('current_product');
    }    
    
}
?>

$myBlock = \Magento\Framework\App\ObjectManager::getInstance()->get('Mageplaza\HelloWorld\Block\HelloWorld');
 

// print current product data
if ($currentProduct = $myBlock->getCurrentProduct()) {
    echo $currentProduct->getName() . '<br />';
    echo $currentProduct->getSku() . '<br />';
    echo $currentProduct->getFinalPrice() . '<br />';
    echo $currentProduct->getProductUrl() . '<br />';
    print_r ($currentProduct->getCategoryIds()) . '<br />';    
}

$myBlock = \Magento\Framework\App\ObjectManager::getInstance()->get('Mageplaza\HelloWorld\Block\HelloWorld');
 
// print current category data
if ($currentCategory = $myBlock->getCurrentCategory()) {    
    echo $currentCategory->getName() . '<br />';
    echo $currentCategory->getUrl() . '<br />';        
}