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产不同的零件，例如Intel厂商和Lenovo厂商 创建电脑类提供让电脑工作的函数，并且调用每个零件工作的接口 测试时组装三台不同的电脑进行工作

案例分析：

代码示例：

#include<iostream>
using namespace std;
#include<string>

//抽象不同零件类
//抽象CPU类
class CPU
{
public:
	//抽象的计算函数
	virtual void calculate() = 0;
};

//抽象显卡类
class VideoCard
{
public:
	//抽象的显示的函数
	virtual void display() = 0;
};

//抽象内存类
class Memory
{
public:
	//抽象的存储函数
	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;
	}

	//提供一个工作的函数
	void work()
	{
		//让零件工作起来，调用接口
		m_cpu->calculate();

		m_vc->display();

		m_mem->storage();

	}

    //提供析构函数释放3个电脑零件
	~Computer()
	{	
		//释放CPU零件
		if (m_cpu != NULL)
		{
			delete m_cpu;
			m_cpu = NULL;
		}

		//释放显卡零件
		if (m_vc != NULL)
		{
			delete m_vc;
			m_vc = NULL;
		}

		//释放内存零件
		if (m_mem != NULL)
		{
			delete m_mem;
			m_mem = NULL;
		}
	}

private:
	CPU *m_cpu;//CPU的零件指针
	VideoCard* m_vc;//显卡的零件指针
	Memory* m_mem;//内存条的零件指针

};

//具体厂商
//Inter厂商
class IntelCPU :public CPU
{
public:
	virtual void calculate()
	{
		cout << "Inter的CPU开始计算了" << endl;
	}
};

class IntelVideoCard :public VideoCard
{
public:
	virtual void display()
	{
		cout << "Inter的显卡开始显示了" << endl;
	}
};

class IntelMemory :public Memory
{
public:
	virtual void storage()
	{
		cout << "Inter的内存条开始存储了" << endl;
	}
};

//Lenovo厂商
class LenovoCPU :public CPU
{
public:
	virtual void calculate()
	{
		cout << "Lenovo的CPU开始计算了" << endl;
	}
};

class LenovoVideoCard :public VideoCard
{
public:
	virtual void display()
	{
		cout << "Lenovo的显卡开始显示了" << endl;
	}
};

class LenovoMemory :public Memory
{
public:
	virtual void storage()
	{
		cout << "Lenovo的内存条开始存储了" << endl;
	}
};

void test()
{
	//第一台电脑零件
	CPU* intelCpu = new IntelCPU;
	VideoCard* intelCard = new IntelVideoCard;
	Memory* intelMem = new IntelMemory;

	cout << "第一台电脑开始工作" << endl;
	//创建第一台电脑
	Computer* computer1 = new Computer(intelCpu, intelCard, intelMem);
	computer1->work();
	delete computer1;

	cout << "-----------------" << endl;
	cout << "第二台电脑开始工作" << endl;
	//第二台电脑组装    可以仿照上面，先创建零件再创建电脑,为了简便,写成以下方式
	Computer* computer2 = new Computer(new LenovoCPU, new LenovoVideoCard, new LenovoMemory);
	computer2->work();
	delete computer2;

	cout << "-----------------" << endl;
	cout << "第三台电脑开始工作" << endl;
	//第三台电脑组装
	Computer* computer3 = new Computer(new LenovoCPU, new IntelVideoCard, new LenovoMemory);
	computer3->work();
	delete computer3;

}

int main()
{
	test();

	return 0;
}