大话设计模式笔记 建造者模式

package Builder;

import java.util.ArrayList;

/**
 * 产品类，由多个部件组成
 *
 */
public class Product {

    ArrayList<String> partList = new ArrayList<String>();

    // 添加产品部件
    public void add(String part) {
        partList.add(part);
    }

    public void show() {
        System.out.println("create product");
        for (String string : partList) {
            System.out.println(string);
        }
    }
}

package Builder;

/**
 * 抽象建造者类，确定产品由两个部件PartA和PartB组成
 * 并声明一个的到产品建造后结果的方法getResult
 *
 */
public abstract class Builder {

    public abstract void buildPartA();

    public abstract void buildPartB();

    public abstract Product getResult();
}

package Builder;

/**
 * 具体建造者类
 *
 */
public class ConcreteBuilder1 extends Builder {

    private Product product=new Product();
    
    @Override
    public void buildPartA() {
        product.add("A");
    }

    @Override
    public void buildPartB() {
        product.add("B");
    }

    @Override
    public Product getResult() {
        return product;
    }

}

package Builder;

public class Director {

    public void  construct(Builder builder) {
        builder.buildPartA();
        builder.buildPartB();
    }
    
    /**
     * 客户端代码，客户不需要知道具体的建造过程
     */
    public static void main(String[] args) {
        Director director=new Director();
        Builder b1=new ConcreteBuilder1();
        director.construct(b1);
        Product p1=b1.getResult();
        p1.show();
    }
}