建造者模式

实验5：建造者模式

本次实验属于模仿型实验，通过本次实验学生将掌握以下内容：

1、理解建造者模式的动机，掌握该模式的结构；

2、能够利用建造者模式解决实际问题。

 

[实验任务一]：计算机组装

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。

实验要求：

1. 画出对应的类图；

 

2.提交源代码；

// 计算机类

class Computer {

    private String cpu;

    private String ram;

    private String hardDrive;

    private String caseType;

 

    public void setCpu(String cpu) {

        this.cpu = cpu;

    }

 

    public void setRam(String ram) {

        this.ram = ram;

    }

 

    public void setHardDrive(String hardDrive) {

        this.hardDrive = hardDrive;

    }

 

    public void setCaseType(String caseType) {

        this.caseType = caseType;

    }

 

    @Override

    public String toString() {

        return "Computer [CPU=" + cpu + ", RAM=" + ram + ", Hard Drive=" + hardDrive + ", Case Type=" + caseType + "]";

    }

}

 

// 抽象建造者类

abstract class Builder {

    protected Computer computer;

 

    public void createNewComputer() {

        computer = new Computer();

    }

 

    public Computer getComputer() {

        return computer;

    }

 

    public abstract void buildCPU();

    public abstract void buildRAM();

    public abstract void buildHardDrive();

    public abstract void buildCaseType();

}

 

// 笔记本建造者类

class LaptopBuilder extends Builder {

    @Override

    public void buildCPU() {

        computer.setCpu("Intel i5");

    }

 

    @Override

    public void buildRAM() {

        computer.setRam("8GB");

    }

 

    @Override

    public void buildHardDrive() {

        computer.setHardDrive("512GB SSD");

    }

 

    @Override

    public void buildCaseType() {

        computer.setCaseType("Ultrabook");

    }

}

 

// 台式机建造者类

class DesktopBuilder extends Builder {

    @Override

    public void buildCPU() {

        computer.setCpu("AMD Ryzen 5");

    }

 

    @Override

    public void buildRAM() {

        computer.setRam("16GB");

    }

 

    @Override

    public void buildHardDrive() {

        computer.setHardDrive("1TB HDD");

    }

 

    @Override

    public void buildCaseType() {

        computer.setCaseType("Tower");

    }

}

 

// 指导者类

class Director {

    private Builder builder;

 

    public Director(Builder builder) {

        this.builder = builder;

    }

 

    public Computer constructComputer() {

        builder.createNewComputer();

        builder.buildCPU();

        builder.buildRAM();

        builder.buildHardDrive();

        builder.buildCaseType();

        return builder.getComputer();

    }

}

 

// 测试类

public class Main {

    public static void main(String[] args) {

        // 建造笔记本电脑

        Builder laptopBuilder = new LaptopBuilder();

        Director laptopDirector = new Director(laptopBuilder);

        Computer laptop = laptopDirector.constructComputer();

        System.out.println(laptop);

 

        // 建造台式机

        Builder desktopBuilder = new DesktopBuilder();

        Director desktopDirector = new Director(desktopBuilder);

        Computer desktop = desktopDirector.constructComputer();

        System.out.println(desktop);

    }

}