magento 2 get collection

1<?php
2namespace Foungento\Theme\Block;
3class Theme extends \Magento\Framework\View\Element\Template
4{    
5    protected $_productCollectionFactory;
6        
7    public function __construct(
8        \Magento\Backend\Block\Template\Context $context,        
9        \Magento\Catalog\Model\ResourceModel\Product\CollectionFactory $productCollectionFactory,        
10        array $data = []
11    )
12    {    
13        $this->_productCollectionFactory = $productCollectionFactory;    
14        parent::__construct($context, $data);
15    }
16    
17    public function getProductCollection()
18    {
19        $collection = $this->_productCollectionFactory->create();
20        $collection->addAttributeToSelect('*');
21        $collection->setPageSize(10); // fetching only 10 products
22        return $collection;
23    }
24}
25?>
26
27/*Display product collection in phtml file
28Print out the product collection in phtml file with the below code:*/
29
30list.phtml
31$productCollection = $block->getProductCollection();
32foreach ($productCollection as $product) {
33    print_r($product->getData());     
34    echo "<br>";
35}

1$om = \Magento\Framework\App\ObjectManager::getInstance();
2$productCollection = $om->create('Magento\Catalog\Model\ResourceModel\Product\Collection');
3$collection = $productCollection->addAttributeToSelect('*')->load();