小白都能懂的设计模式 java版建造者模式拓展小节（超详细）

本文链接：https://blog.youkuaiyun.com/weixin_45806131/article/details/109253198

本文探讨了如何通过静态内部类简化Director-Builder模式，以麦当劳套餐为例，展示了如何让服务员（具体建造者）拥有更大的灵活性。通过实例代码，介绍了抽象建造者与产品之间的关系，并对比了传统模式和简化后的优点和适用场景。

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上一篇的例子中
https://blog.youkuaiyun.com/weixin_45806131/article/details/109235373

是Build模式的常规用法，Director类在Bulider模式中具有非常重要的作用，用于指导具体构建者如何构建产品，控制调用的先后顺序，并且向调用者返回完整的产品类，但是有时候需要简化系统结构，可以把Director和抽象建造者进行结合

可以通过静态内部类方式实现零件无需装配构造，这种方式更加灵活，更加符合定义

比如麦当劳的套餐，服务员（具体建造者）可以随意搭配几种产品（零件）组成一款套餐（产品），然后出售给客户，比第一种少了指挥者，将指挥权交给了用户，使得产品创建更加灵活

比如用一个点餐例子

建造者：

package bulidDemo;

//建造者
public abstract class Bulider1 {
    abstract public Bulider1 builderA1(String msg);    //汉堡
    abstract public Bulider1 builderB1(String msg);    //可乐
    abstract public Bulider1 builderC1(String msg);    //薯条
    abstract public Bulider1 builderD1(String msg);    //甜点

    abstract Product1 getProduct();

}

产品：

package bulidDemo;

//产品，套餐
public class Product1 {
    private String BuildA1 = "汉堡";
    private String BuildB1 = "可乐";
    private String BuildC1 = "薯条";
    private String BuildD1 = "甜点";

    public String getBuildA1() {
        return BuildA1;
    }

    public void setBuildA1(String buildA1) {
        BuildA1 = buildA1;
    }

    public String getBuildB1() {
        return BuildB1;
    }

    public void setBuildB1(String buildB1) {
        BuildB1 = buildB1;
    }

    public String getBuildC1() {
        return BuildC1;
    }

    public void setBuildC1(String buildC1) {
        BuildC1 = buildC1;
    }

    public String getBuildD1() {
        return BuildD1;
    }

    public void setBuildD1(String buildD1) {
        BuildD1 = buildD1;
    }

    @Override
    public String toString() {
        return "Product1{" +
                "BuildA1='" + BuildA1 + '\'' +
                ", BuildB1='" + BuildB1 + '\'' +
                ", BuildC1='" + BuildC1 + '\'' +
                ", BuildD1='" + BuildD1 + '\'' +
                '}';
    }
}

服务员：

package bulidDemo;

//具体的建造者
public class Workerman extends Bulider1{

    private Product1 product;

    public Workerman() {
        product = new Product1();
    }

    @Override
    public Bulider1 builderA1(String msg) {
        product.setBuildA1(msg);
        return this;
    }

    @Override
    public Bulider1 builderB1(String msg) {
        product.setBuildB1(msg);
        return this;
    }

    @Override
    public Bulider1 builderC1(String msg) {
        product.setBuildC1(msg);
        return this;
    }

    @Override
    public Bulider1 builderD1(String msg) {
        product.setBuildD1(msg);
        return this;
    }

    @Override
    Product1 getProduct() {
        return product;
    }
}

Test测试类：

package bulidDemo;

public class Test1 {
    public static void main(String[] args) {
        //服务员
        Workerman worker = new Workerman();
        Product1 product = worker.getProduct();
        System.out.println(product.toString());

        //链式编程
        product= worker.builderA1("全家桶").builderB1("雪碧").getProduct();

        System.out.println(product.toString());
    }
}