c++?創(chuàng)建型設(shè)計模式工廠方法Factory?Method示例詳解

更新時間：2023年09月06日 11:50:08 作者：菜皮日記

這篇文章主要為大家介紹了c++?創(chuàng)建型設(shè)計模式工廠方法Factory?Method示例詳解,有需要的朋友可以借鑒參考下,希望能夠有所幫助,祝大家多多進步,早日升職加薪

簡介

工廠方法中，每一個具體工廠類都對應(yīng)創(chuàng)建一個具體產(chǎn)品類，所有具體工廠類都實現(xiàn)抽象工廠，所有具體產(chǎn)品類都實現(xiàn)抽象產(chǎn)品。

抽象工廠定義了創(chuàng)建抽象產(chǎn)品的方法簽名，具體工廠類各自實現(xiàn)各自邏輯，來創(chuàng)建具體的產(chǎn)品。

角色

抽象工廠 Abstract Factory

定義創(chuàng)建產(chǎn)品的方法簽名，即Factory Method
抽象產(chǎn)品 Abstract Product

定義產(chǎn)品的基本屬性
具體工廠 Concrete Factory

實現(xiàn)自抽象工廠，并實現(xiàn) Factory Method，實現(xiàn)如何創(chuàng)建具體產(chǎn)品。
具體產(chǎn)品 Concrete Product

實現(xiàn)具體產(chǎn)品基本屬性

類圖

如圖所示，Dialog抽象工廠可以創(chuàng)建Button抽象產(chǎn)品，WindowsDialog和WebDialog都是具體工廠，負責(zé)創(chuàng)建WindownsButton和HTMLButton。

代碼

abstract class Creator
{
    abstract public function factoryMethod(): Product;
    public function someOperation(): string
    {
        $product = $this->factoryMethod();
        $result = "Creator: The same creator's code has just worked with " . $product->operation();
        return $result;
    }
}
class ConcreteCreator1 extends Creator
{
    public function factoryMethod(): Product
    {
        return new ConcreteProduct1();
    }
}
class ConcreteCreator2 extends Creator
{
    public function factoryMethod(): Product
    {
        return new ConcreteProduct2();
    }
}
interface Product
{
    public function operation(): string;
}
class ConcreteProduct1 implements Product
{
    public function operation(): string
    {
        return "{Result of the ConcreteProduct1}";
    }
}
class ConcreteProduct2 implements Product
{
    public function operation(): string
    {
        return "{Result of the ConcreteProduct2}";
    }
}
function clientCode(Creator $creator)
{
    echo "Client: I'm not aware of the creator's class, but it still works.\n" . $creator->someOperation() . "\n";
}
echo "App: Launched with the ConcreteCreator1.\n";
clientCode(new ConcreteCreator1());
echo "App: Launched with the ConcreteCreator2.\n";
clientCode(new ConcreteCreator2());

output

App: Launched with the ConcreteCreator1.
Client: I'm not aware of the creator's class, but it still works.
Creator: The same creator's code has just worked with {Result of the ConcreteProduct1}
App: Launched with the ConcreteCreator2.
Client: I'm not aware of the creator's class, but it still works.
Creator: The same creator's code has just worked with {Result of the ConcreteProduct2}

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