Java：如果将十进制数为0的双精度型数字输出为整数格式(Java: how to output double-type number to integer format if its decimal is 0)

 $cart数组的每个值都是一个ShoppingCart\Entity\ShoppingCartEntity并实现了ShoppingCart\Entity\ShoppingCartEntityInterface 。 该界面提供您需要的所有公共方法： 
 
interface ShoppingCartEntityInterface
{
public function getId();
public function getProduct();
public function getQty();
public function getPrice();
public function setId($id);
public function setProduct($product);
public function setQty($qty);
public function setPrice($price);
public function setProductProperties(array $properties);
public function getProductProperties();
}

Each value of $cart array is a ShoppingCart\Entity\ShoppingCartEntity and implements ShoppingCart\Entity\ShoppingCartEntityInterface. This interface provides all public methods you need :
 
interface ShoppingCartEntityInterface
{
public function getId();
public function getProduct();
public function getQty();
public function getPrice();
public function setId($id);
public function setProduct($product);
public function setQty($qty);
public function setPrice($price);
public function setProductProperties(array $properties);
public function getProductProperties();
}