Model/ResourceModel/Cron/Collection.php
public function _construct()
    {
        $this->_init(\Magento\Cron\Model\Schedule::class, \Magento\Cron\Model\ResourceModel\Schedule::class);
    }
public function _construct()
    {
        $this->_init(\Magento\Cron\Model\Schedule::class, \Magento\Cron\Model\ResourceModel\Schedule::class);
    }
public function _construct ( ) { $ this -> _init ( \ Magento \ Cron \ Model \ Schedule :: class , \ Magento \ Cron \ Model \ ResourceModel \ Schedule :: class ) ; }
Initialize resource collection

@return null
Initialize resource collection