建造者模式

一、定义：建造者模式（builder）:将一个复杂的对象构建与它的表示分离，使得同样的构建过程可以创建不同的表示。

二、示例代码：

/*产品类*/
public class Product {
    private List parts = new ArrayList();

    public void addPart(String part) {
        parts.add(part);
    }

    public void show() {
        for (String part : parts
        ) {
            System.out.println("产品建造过程");
            System.out.println("装配：" + part);
        }
    }
}

/*抽象建造者类*/
public abstract class Builder {
    public abstract void builderA();

    public abstract void builderB();

    public abstract Product getResult();
}

/*具体建造类*/
public class ConcreteBuilderA extends Builder {
    private Product product = new Product();

    @Override
    public void builderA() {
        product.addPart("part a");
    }

    @Override
    public void builderB() {
        product.addPart("part b");
    }

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

/*具体建造类*/
public class ConcreteBuilderB extends Builder {
    private Product product = new Product();

    @Override
    public void builderA() {
        product.addPart("part w");
    }

    @Override
    public void builderB() {
        product.addPart("part q");
    }

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

/*指挥者类*/
public class Director {
    public void Constructor(Builder builder) {
        builder.builderA();
        builder.builderB();
    }
}

/*客户端类*/
public class Client {
    public static void main(String[] args) {
        Director director = new Director();
        Builder builder = new ConcreteBuilderA();
        director.Constructor(builder);
        Product product = builder.getResult();
        product.show();
    }
}