建造者模式——C++实现

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++

#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：