工厂方法模式 Factory Method

#include <iostream>

using namespace std;
class Fruit{
public:
    virtual void show()=0;
};



class Apple:public Fruit{
public:
    void show(){
        cout<<"i am an apple"<<endl;
    }
};

class Pear:public Fruit{
public:
    void show(){
        cout<<"i am a pear"<<endl;
    }
};

class FruitFactory{
public:
    virtual Fruit * createFruit()=0;
};

class AppleFactory:public FruitFactory{
public:
    Fruit * createFruit(){
        return new Apple();
    }
};

class PearFactory:public FruitFactory{
public:
    Fruit * createFruit(){
        return new Pear();
    }
};
int main(int argc, char* argv[])
{
    //工厂方法模式
    //创建不同的工厂，各自负责各自的产品

    FruitFactory * applefactory = new AppleFactory();
    Fruit * product = applefactory->createFruit();
    product->show();
    delete product;
    delete applefactory;

    FruitFactory * pearfactory = new PearFactory();
    Fruit * product2 = pearfactory->createFruit();
    product2->show();
    delete product2;
    delete applefactory;

    return 0;
}