建造者模式——C++实现

问题描述：

使用建造者模式，完成下述任务：计算机组装工厂可以将CPU、内存、硬盘、主机等硬件设备组装在一起构成计算机，计算机的类型可以是笔记本，也可以是台式机。

类图：

 

C++源代码：

#include<iostream>
#include<string>
using namespace std;
//产品类——Computer类
class Computer{
private:
	string CPU;
	string RAM;
	string Hard;
	string Host;
public:
	string getCPU(){
		return CPU;
	}
	string getRAM(){
		return RAM;
	}
	string getHard(){
		return Hard;
	}
	string getHost(){
		return Host;
	}
	void setCPU(string cpu){
		CPU=cpu;
	}
	void setRAM(string ram){
		RAM=ram;
	}
	void setHard(string hard){
		Hard=hard;
	}
	void setHost(string host){
		Host=host;
	}
};
//抽象建造者类——ComputerBuilder类
class ComputerBuilder{
protected:
	Computer computer;
public:
	virtual void buildCPU()=0;
	virtual void buildRAM()=0;
	virtual void buildHard()=0;
	virtual void buildHost()=0;
	Computer getComputer(){
		return computer;
	}
};
//具体建造者类——LaptopComputerBuilder类
class LaptopComputerBuilder:public ComputerBuilder{
public:
    void buildCPU() {
		computer.setCPU("安装笔记本CPU");
	}
	void buildRAM() {
		computer.setRAM("安装笔记本内存");
	}
	void buildHard() {
		computer.setHard("安装笔记本硬盘");
	}
	void buildHost() {
		computer.setHost("安装笔记本主机");
	}
};
//具体建造者类——DesktopComputerBuilder类
class DesktopComputerBuilder:public ComputerBuilder{
public:
    void buildCPU() {
		computer.setCPU("安装台式机CPU");
	}
	void buildRAM() {
		computer.setRAM("安装台式机内存");
	}
	void buildHard() {
		computer.setHard("安装台式机硬盘");
	}
	void buildHost() {
		computer.setHost("安装台式机主机");
	}
};
//指挥者类——Director类
class Director{
private:
	ComputerBuilder* cb;
public:
	void setComputerBuilder(ComputerBuilder *c){
		cb=c;
	}
	Computer construct(){
		cb->buildCPU();
		cb->buildRAM();
		cb->buildHard();
		cb->buildHost();
		return cb->getComputer();
	}
};
//测试类
int main(){
	ComputerBuilder* cb=NULL;
	int i;
	cout<<"请选择：1.笔记本 2、台式机"<<endl;
	cin>>i;
	if(i==1){
		cb=new LaptopComputerBuilder();
	}else if(i==2){
		cb=new DesktopComputerBuilder();
	}else{
		cout<<"输入无效！";
	}
	Director* dir=new Director();
	dir->setComputerBuilder(cb);
	Computer computer=dir->construct();
	cout<<"计算机组成："<<endl;
	cout<<computer.getCPU()<<endl;
	cout<<computer.getRAM()<<endl;
	cout<<computer.getHard()<<endl;
	cout<<computer.getHost()<<endl;
	delete cb;
	delete dir;
	return 0;
}

　　

运行结果：