建造者模式——java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：

 

 

Java代码：

//Computer.java
package shiyan5;

public class Computer {
    private String CPU;
    private String RAM;
    private String Hard;
    private String Host;
    public String getCPU() {
        return CPU;
    }
    public void setCPU(String cPU) {
        CPU = cPU;
    }
    public String getRAM() {
        return RAM;
    }
    public void setRAM(String rAM) {
        RAM = rAM;
    }
    public String getHard() {
        return Hard;
    }
    public void setHard(String hard) {
        Hard = hard;
    }
    public String getHost() {
        return Host;
    }
    public void setHost(String host) {
        Host = host;
    }
}
//ComputerBuilder.java
package shiyan5;

public abstract class ComputerBuilder {
    protected Computer computer=new Computer();
    public abstract void buildCPU();
    public abstract void buildRAM();
    public abstract void buildHard();
    public abstract void buildHost();
    public Computer getComputer()
    {
        return computer;  
    }
}
//DesktopComputerBuilder.java
package shiyan5;

public class DesktopComputerBuilder extends ComputerBuilder{
    public void buildCPU() {
        computer.setCPU("安装台式机CPU");
    }
    public void buildRAM() {
        computer.setRAM("安装台式机内存");
    }
    public void buildHard() {
        computer.setHard("安装台式机硬盘");
    }
    public void buildHost() {
        computer.setHost("安装台式机主机");
    }
}
//LaptopComputerBuilder.java
package shiyan5;

public class LaptopComputerBuilder extends ComputerBuilder{
    public void buildCPU() {
        computer.setCPU("安装笔记本CPU");
    }
    public void buildRAM() {
        computer.setRAM("安装笔记本内存");
    }
    public void buildHard() {
        computer.setHard("安装笔记本硬盘");
    }
    public void buildHost() {
        computer.setHost("安装笔记本主机");
    }
}  
//Director.java
package shiyan5;
 
public class Director {
    private ComputerBuilder cb;
    public void setComputerBuilder(ComputerBuilder c)
    {
        cb=c;
    }
    public Computer construct()
    {
        cb.buildCPU();  
        cb.buildRAM();
        cb.buildHard();
        cb.buildHost();
        return cb.getComputer();
    }
}
//main.java
package shiyan5;

import java.util.Scanner;

public class main {
    public static void main(String args[])
    {
        ComputerBuilder cb = null;
        System.out.println("请选择：1、笔记本 2、台式机");
        Scanner input=new Scanner(System.in);
        int i=input.nextInt();
        if(i==1) {
            cb=new LaptopComputerBuilder();
        }else if(i==2) {
            cb=new DesktopComputerBuilder();
        }else {
            System.out.println("输入无效！");
        }
        Director dir=new Director();
        dir.setComputerBuilder(cb); 
        Computer computer=dir.construct();
        System.out.println("计算机组成：");
        System.out.println(computer.getCPU());
        System.out.println(computer.getRAM());
        System.out.println(computer.getHard());
        System.out.println(computer.getHost());
    }
}

运行结果：