创建型模式--工厂方法模式-优快云博客

本文通过一个面包制作的例子介绍了工厂模式的设计实现。该程序利用面向对象的方法创建了不同类型的面包，并通过工厂类来实例化这些面包类型。

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#include <iostream>
using namespace std;

class BreadMaker
{
public:
    virtual void GetBread()
    {
        // NOTING
    }
};

// 黑面包代码
class BlackBread : public BreadMaker
{
public:
    void GetBread()
    {
        cout << "小面烤出了黑面包" << endl;
    }
};

// 蜂蜜面包代码
class HoneyBread : public BreadMaker
{
public:
    void GetBread()
    {
        cout << "小面烤出了蜂蜜面包" << endl;
    }
}

// 白面包代码
class WhiteBread : public BreadMaker
{
public:
    void GetBread()
    {
        cout << "小面烤出了白面包" << endl;
    }
}

class IFactory
{
public:
    virtual BreadMaker CreateBread() = 0;
}

// 黑面包工厂
class BlackBreadFactory : public IFactory
{
public:
    BreadMaker* CreateBread()
    {
        return new BlackBread();
    }
}

// 蜂蜜面包工厂
class HoneyBreadFactory : public IFactory
{
public:
    BreadMaker* CreateBread()
    {
        return new HoneyBread();
    }
}

// 白面包工厂
class WhiteBreadFactory : public IFactory
{
public:
    BreadMaker* CreateBread()
    {
        return new WhiteBread();
    }
}

int main() 
{
    BreadMaker *breadMaker = NULL;
    cout << "小面的面包店开业了！" << endl;

    cout << "顾客要黑面包" << endl;
    IFactory *breadFactory = new BlackBreadFactory();
    breadMaker = breadFactory->CreateBread();
    breadMaker->GetBread();

    cout << "顾客要蜂蜜面包" << endl;
    IFactory *breadFactory = new HoneyBreadFactory();
    breadMaker = breadFactory->CreateBread();    breadMaker->GetBread();

    cout << "顾客要白面包" << endl;
    IFactory *breadFactory = new WhiteBreadFactory();
    breadMaker = breadFactory->CreateBread();    
    breadMaker->GetBread();

    return 0;
}