《工廠模式》

所謂工廠模式，其實就是用來產生實例的地方。生產某一類型的產品。因此也是利用了類管理和類多態的一個特性吧。

 

下面直接上圖

 

在Factory 中產生human的實例，

 

然後通過實例來調用方法。

// Factory.cpp : 定義控制檯應用程序的入口點。
/************************************************************************/
/* @filename    Factory.cpp
   @author       wallwind
   @createtime    2012/10/20 10:36
   @function      工廠模式
   @email       [email protected]
*/
/************************************************************************/

#include "stdafx.h"
#include <iostream>
#include <stdlib.h>

using namespace std;

enum HumanType
{
    white = 0,black,yello,
};

class Human
{
    public:
        //Human(){}
        virtual~Human(){}

        virtual void run() = 0;
        virtual void sleep()=0;

};

class WhiteMan:public Human
{
public:
    WhiteMan(){}
    ~WhiteMan(){}

    void run()
    {
        cout<<"WhiteMan:run()"<<endl;
    }

    void sleep()
    {
        cout<<"WhiteMan:sleep()"<<endl;
    }

};

class BlackMan:public Human
{
public:
    BlackMan(){}
    ~BlackMan(){}

    void run()
    {
        cout<<"BlackMan:run()"<<endl;
    }

    void sleep()
    {
        cout<<"BlackMan:sleep()"<<endl;
    }

};

class YellowMan:public Human
{
public:
    YellowMan(){}
    ~YellowMan(){}

    void run()
    {
        cout<<"YellowMan:run()"<<endl;
    }

    void sleep()
    {
        cout<<"YellowMan:sleep()"<<endl;
    }

};

class HumanFactory
{

public:
    HumanFactory(){}
    ~HumanFactory(){}

    static Human* createHuman(HumanType htp)
     {
        Human* human;
        switch (htp)
        {
        case white:
            human = new WhiteMan();
            break;
        case black:
            human = new BlackMan();
            break;
        case yello:
            human = new YellowMan();
        default:
            human = NULL;
        }
        return human;
     }

};

int _tmain(int argc, _TCHAR* argv[])
{

    int type = rand()%2;
    cout<<type<<endl;

    Human * mhum;
     mhum = HumanFactory::createHuman((HumanType)type);
    if (mhum ==NULL)
    {
        cout<<"no human"<<endl;
        exit(0);
    }
    mhum->run();
    mhum->sleep();

    return 0;