多态案例 -- 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。

 

#include
using namespace std;

//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:
	//显示的计算函数
	virtual void display() = 0;
};
//抽象内存条类
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;
	}
	//提供工作的函数
	//让零件工作起来，调用接口
	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;
		}
		//释放内存条零件
		if (m_mem != NULL){
			delete m_mem;
			m_mem = NULL;
		}
	}

private:
	CPU* m_cpu; //CPU的指针零件
	VideoCard* m_vc;  //显卡零件指针
	Memory* m_mem; //内存条零件指针
};

//具体厂商
//Intel厂商
class IntelCPU :public CPU{
public:
	virtual void calculate(){
		cout << "Intel的CPU开始计算了！" << endl;
	}
};
class IntelVideoCard :public VideoCard{
public:
	virtual void display(){
		cout << "Intel的显卡开始显示了！" << endl;
	}
};
class IntelMemory :public Memory{
public:
	virtual void storage(){
		cout << "Intel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 test01(){
	//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
	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() {
	test01();

	system("pause");
	return 0;
}

 https://www.bilibili.com/video/BV1et411b73Z?p=142&spm_id_from=pageDriver&vd_source=d239c7cf48aa4f74eccfa736c3122e65https://www.bilibili.com/video/BV1et411b73Z?p=142&spm_id_from=pageDriver&vd_source=d239c7cf48aa4f74eccfa736c3122e65