设计模式原型模式

-------------------------------浅拷贝-----------------------------------------
@Data
public class ShopItem implements Cloneable {
    private String shopItemName;
    public ShopItem clone() throws CloneNotSupportedException {
        ShopItem clone = (ShopItem) super.clone();
        return clone;
    }
}

@Data
public class Shop implements Cloneable {

    private String shopName;
    private Integer shopNumber;
    private ShopItem shopItem;

    public Shop(String shopName, Integer shopNumber, ShopItem shopItem) {
        this.shopName = shopName;
        this.shopNumber = shopNumber;
        this.shopItem = shopItem;
    }

    public static void main(String[] args) throws CloneNotSupportedException {
        ShopItem shopItem = new ShopItem();
        shopItem.setShopItemName("shopItemName1");
        Shop shop = new Shop("shopName1", 10, shopItem);
        Shop clone = shop.clone();
        System.out.println("shop: " + shop);
        System.out.println("clone: " + clone);
        System.out.println("-----------------");
        shopItem.setShopItemName("shopItemName2");
        System.out.println("shop: " + shop);
        System.out.println("clone: " + clone);
    }

    public Shop clone() throws CloneNotSupportedException {
        Shop shop = (Shop) super.clone();
//        ShopItem clone = this.shopItem.clone();
//        shop.setShopItem(clone);
        return shop;
    }
}

打印结果:

shop: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))
clone: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))
-----------------
shop: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName2))
clone: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName2))

------------------------------------------------------深拷贝------------------------------------------------------------------------------

@Data
public class ShopItem implements Cloneable {
    private String shopItemName;
    public ShopItem clone() throws CloneNotSupportedException {
        ShopItem clone = (ShopItem) super.clone();
        return clone;
    }
}

@Data
public class Shop implements Cloneable {

    private String shopName;
    private Integer shopNumber;
    private ShopItem shopItem;

    public Shop(String shopName, Integer shopNumber, ShopItem shopItem) {
        this.shopName = shopName;
        this.shopNumber = shopNumber;
        this.shopItem = shopItem;
    }

    public static void main(String[] args) throws CloneNotSupportedException {
        ShopItem shopItem = new ShopItem();
        shopItem.setShopItemName("shopItemName1");
        Shop shop = new Shop("shopName1", 10, shopItem);
        Shop clone = shop.clone();
        System.out.println("shop: " + shop);
        System.out.println("clone: " + clone);
        System.out.println("-----------------");
        shopItem.setShopItemName("shopItemName2");
        System.out.println("shop: " + shop);
        System.out.println("clone: " + clone);
    }

    public Shop clone() throws CloneNotSupportedException {
        Shop shop = (Shop) super.clone();
        ShopItem clone = this.shopItem.clone();
        shop.setShopItem(clone);
        return shop;
    }
}

打印结果:

shop: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))
clone: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))
-----------------
shop: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName2))
clone: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))

 ------------------------------------------------------------反序列化方式----------------------------------------------------------------

@Data
public class Shop implements Cloneable, Serializable {
    private String shopName;
    private Integer shopNumber;
    private ShopItem shopItem;

    public Shop(String shopName, Integer shopNumber, ShopItem shopItem) {
        this.shopName = shopName;
        this.shopNumber = shopNumber;
        this.shopItem = shopItem;
    }

    public static void main(String[] args) throws CloneNotSupportedException {
        ShopItem shopItem = new ShopItem();
        shopItem.setShopItemName("shopItemName1");
        Shop shop = new Shop("shopName1", 10, shopItem);
        Shop clone = shop.clone();
        System.out.println("shop: " + shop);
        System.out.println("clone: " + clone);
        System.out.println("-----------------");
        shopItem.setShopItemName("shopItemName2");
        System.out.println("shop: " + shop);
        System.out.println("clone: " + clone);
    }

    public Shop clone() {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try(ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(this);
        } catch (IOException e) {
            e.printStackTrace();
        }

        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        try(ObjectInputStream oos = new ObjectInputStream(bais)) {
            Shop shop = (Shop) oos.readObject();
            return shop;
        } catch (IOException | ClassNotFoundException e) {
            e.printStackTrace();
        }
        return null;
    }
}

@Data
public class ShopItem implements Cloneable, Serializable {
    private String shopItemName;

//    public ShopItem clone() throws CloneNotSupportedException {
//        ShopItem clone = (ShopItem) super.clone();
//        return clone;
//    }
}

打印结果:

shop: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))
clone: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))
-----------------
shop: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName2))
clone: Shop(shopName=shopName1, shopNumber=10, shopItem=ShopItem(shopItemName=shopItemName1))