C++_简单工厂模式_代码案例

#include <iostream>
using namespace std;

// 水果抽象类
class CAbstractFruit
{
public:
    virtual void ShowName() = 0;
};

// 苹果类
class CApple : public CAbstractFruit
{
public:
    virtual void ShowName()
    {
        cout << " 我是苹果！" << endl;
    }
};

// 香蕉类
class CBanana : public CAbstractFruit
{
public:
    virtual void ShowName()
    {
        cout << " 我是香蕉！" << endl;
    }
};

// 鸭梨类
class CPear : public CAbstractFruit
{
public:
    virtual void ShowName()
    {
        cout << " 我是鸭梨！" << endl;
    }
};

// 水果工厂类
class CFruitFactory
{
public:
    static CAbstractFruit* CreateFruit(string flag)
    {
        if (flag == "apple")
        {
            return new CApple;
        }
        else if (flag == "banana")
        {
            return new CBanana;
        }
        else if (flag == "pear")
        {
            return new CPear;
        }
        else
        {
            return nullptr;
        }
    }
};

int main()
{
    CAbstractFruit* fruit = CFruitFactory::CreateFruit("apple");
    if (fruit != nullptr)
    {
        fruit->ShowName();
    }
    delete fruit;

    fruit = CFruitFactory::CreateFruit("banana");
    if (fruit != nullptr)
    {
        fruit->ShowName();
    }
    delete fruit;

    fruit = CFruitFactory::CreateFruit("pear");
    if (fruit != nullptr)
    {
        fruit->ShowName();
    }
    delete fruit;
    cin.get();
    return 0;
}