从零玩转设计模式之建造者模式-jianzaozhemoshi

title: 从零玩转设计模式之建造者模式
date: 2022-12-08 18:15:30.898
updated: 2022-12-23 15:35:58.428
url: http://www.yby6.com/archives/jianzaozhemoshi
categories: 
- 设计模式
tags: 
- 设计模式
- 建造者模式

/**
 * 产品 计算机
 *
 * @author yang shuai
 * @date 2022/12/4
 */
public class Computer {

    private final String cpu;// 必须
    private final String ram;// 必须
    private int usbCount;// 可选
    private String keyboard;// 可选
    private String display;// 可选

    public Computer(String cpu, String ram) {
        this.cpu = cpu;
        this.ram = ram;
    }

    public void setUsbCount(int usbCount) {
        this.usbCount = usbCount;
    }

    public void setKeyboard(String keyboard) {
        this.keyboard = keyboard;
    }

    public void setDisplay(String display) {
        this.display = display;
    }

    @Override
    public String toString() {
        return "Computer{" + "cpu='" + cpu + '\'' + ", ram='" + ram + '\'' + ", usbCount=" + usbCount + ", keyboard='" + keyboard + '\'' + ", display='" + display + '\'' + '}';
    }


}

public abstract class ComputerBuilder {
    public abstract void buildCount(int usbCount);
    public abstract void buildKeyboard(String keyBoard);
    public abstract void buildDisplay(String display);

    public abstract Computer makeComputer();
}

public class HWComputerBuilder extends ComputerBuilder{
    private Computer computer;
    public HWComputerBuilder(String cpu, String ram) {
        computer=new Computer(cpu,ram);
    }
    @Override
    public void buildCount(int usbCount) {
        computer.setUsbCount(usbCount);
    }

    @Override
    public void buildKeyboard(String keyBoard) {
        computer.setKeyboard(keyBoard);
    }

    @Override
    public void buildDisplay(String display) {
        computer.setDisplay(display);
    }

    @Override
    public Computer makeComputer() {
        return computer;
    }
}

public class ComputerDirector {
    private ComputerBuilder builder;
    public void setBuilder(ComputerBuilder builder) {
        this.builder = builder;
    }

    public Computer makeComputer(int useCount,String display,String keyBoard){
       builder.buildCount(useCount);
       builder.buildDisplay(display);
       builder.buildKeyboard(keyBoard);
       return builder.makeComputer();
    }
}

/**
 * 使用静态内部类构造数据
 *
 * @author yang shuai
 * @date 2022/12/9
 */
public class Computer {
    private final String cpu;//必须
    private final String ram;//必须
    private final int usbCount;//可选
    private final String keyboard;//可选
    private final String display;//可选

    @Override
    public String toString() {
        return "Computer{" + "cpu='" + cpu + '\'' + ", ram='" + ram + '\'' + ", usbCount=" + usbCount + ", keyboard='" + keyboard + '\'' + ", display='" + display + '\'' + '}';
    }

    private Computer(Builder computerBuilder) {
        this.cpu = computerBuilder.cpu;
        this.ram = computerBuilder.ram;
        this.usbCount = computerBuilder.usbCount;
        this.keyboard = computerBuilder.keyboard;
        this.display = computerBuilder.display;
    }

    public static class Builder {
        private final String cpu;//必须
        private final String ram;//必须
        private int usbCount;//可选
        private String keyboard;//可选
        private String display;//可选

        public Builder(String cup, String ram) {
            this.cpu = cup;
            this.ram = ram;
        }

        public Builder buildUsbCount(int usbCount) {
            this.usbCount = usbCount;
            return this;
        }


        public Builder buildKeyboard(String keyboard) {
            this.keyboard = keyboard;
            return this;
        }

        public Builder buildDisplay(String display) {
            this.display = display;
            return this;
        }

        public Computer build() {
            return new Computer(this);
        }
    }
}