public function __construct(\Weapon $weapon, \Armor $armor, array $rings = [], $hp = 100)
{
$this->hp = $hp;
$this->damage = $weapon->getDamage();
$this->cost += $weapon->getCost();
$this->armor = $armor->getArmor();
$this->cost += $armor->getCost();
foreach ($rings as $ring) {
$this->damage += $ring->getDamage();
$this->armor += $ring->getArmor();
$this->cost += $ring->getCost();
}
}