C++多态案例三.电脑组装

案例描述：

电脑主要组成部件为CPU（用于计算），显卡（用于显示），内存条（用于存储）

将每个零件封装出抽象基类，并且提供不同的厂商生成不同的零件，例如intel厂商和Lenovo厂商

创建电脑类提供让电脑工作的函数，并且调用每个零件的工作接口

测试时组装三台不同电脑进行工作

例:

#include <iostream>
#include <string> 
using namespace std;
//CPU 
class CPU
{
public:
	virtual void calculate() = 0;
};
//显卡 
class VideoCard
{
public:
	virtual void display() = 0; 
};
//硬盘 
class Memory
{
public:
	virtual void storage() = 0; 
};

//电脑类
class Computer 
{
public:
	Computer(CPU* cpu, VideoCard* vc, Memory* mem)
	{
		m_cpu = cpu;
		m_vc = vc;
		m_mem = mem;
	}
	//提供工作的函数
	void work()
	{
		//让零件工作 
		m_cpu->calculate();
		m_vc->display();
		m_mem->storage();
	} 
	//提供析构函数 释放3个电脑零件
	~Computer()
	{
		if(m_cpu != NULL)
		{
			delete m_cpu;
			m_cpu = NULL;	
		}	
		if(m_vc != NULL)
		{
			delete m_vc;
			m_vc = NULL;	
		}	
		if(m_mem != NULL)
		{
			delete m_mem;
			m_mem = NULL;	
		}	
	} 
private:
	CPU* m_cpu;
	VideoCard* m_vc;
	Memory* m_mem; 
}; 

//Inter零件厂商
class IntelCPU :public CPU
{
	virtual void calculate()
	{
		cout << "这是Inter的CPU ！" << endl; 
	}
};
class IntelCard :public VideoCard
{
	virtual void display()
	{
		cout << "这是Inter的显卡 ！" << endl; 
	}
};
class IntelMemory :public Memory
{
	virtual void storage()
	{
		cout << "这是Inter的硬盘 ！" << endl; 
	}
};

//Lenovo零件厂商
class LenovoCPU :public CPU
{
	virtual void calculate()
	{
		cout << "这是Lenovo的CPU ！" << endl; 
	}
}; 
class LenovoVideoCard :public VideoCard
{
	virtual void display()
	{
		cout << "这是Lenovo的显卡 ！" << endl; 
	}
};
class LenovoMemory:public Memory
{
	virtual void storage()
	{
		cout << "这是Lenovo的硬盘 ！" << endl; 
	}
};

void test01()
{
	//零件
	CPU* intelCpu = new IntelCPU;
	VideoCard* intelCard = new IntelCard; 
	Memory* IntelMem = new IntelMemory;
	
	CPU* LenovoCpu = new LenovoCPU;
	VideoCard* LenovoCard = new LenovoVideoCard; 
	Memory* LenovoMem = new LenovoMemory;
	
	//创建第一台电脑
	cout << "第一台电脑" << endl;
	Computer* computer1 = new Computer(intelCpu,intelCard,IntelMem); 
	computer1->work();
	delete computer1;
	//创建第二台电脑
	cout << "第二台电脑" << endl;
	Computer* computer2 = new Computer(LenovoCpu,LenovoCard,LenovoMem); 
	computer2->work();
	delete computer2;
	//创建第三台电脑
	cout << "第三台电脑" << endl;
	Computer* computer3 = new Computer(new LenovoCPU,new IntelCard,new LenovoMemory); 
	computer2->work();
	delete computer2; 
}
int main()
{	
	test01();
	 
	system("pause");
	
	return 0;	
}