symfony规范化是如何实例化的？

// src/Entity/User.php
namespace App\Entity;

use Doctrine\Common\Collections\ArrayCollection;
use Doctrine\Common\Collections\Collection;
use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class User
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=180, unique=true)
     */
    private $email;

    /**
     * @ORM\OneToMany(targetEntity=Address::class, mappedBy="user", cascade=["persist", "remove"])
     */
    private $addresses;

    public function __construct()
    {
        $this->addresses = new ArrayCollection();
    }

    // Getters and setters...
}

// src/Entity/Address.php
namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 */
class Address
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string", length=255)
     */
    private $street;

    /**
     * @ORM\ManyToOne(targetEntity=User::class, inversedBy="addresses")
     * @ORM\JoinColumn(nullable=false)
     */
    private $user;

    // Getters and setters...
}