建造者模式

1. 建造者抽象类或接口

public abstract class AbstractBuilder {
    public abstract void setPart(List list);
    public abstract AbstractProduct builderProduct();
}

2. 建造者抽象类或接口实现类

public class ConcreteBuilder extends AbstractBuilder {
    AbstractProduct product = new ConcreteProduct();
    @Override
    public void setPart(List list) {
        //产品的组装顺序等内部逻辑
        product.doSomething();
    }
    @Override
    public AbstractProduct builderProduct() {
        return this.product;
    }
}

3. 产品抽象类或接口

public abstract class AbstractProduct {
    public abstract void doSomething();
}

4. 产品抽象类或接口实现类

public class ConcreteProduct extends AbstractProduct {
    @Override
    public void doSomething() {
        //具体操作
    }
}

5. 使用

public class Director {
    private AbstractBuilder builder = new ConcreteBuilder();
    public AbstractProduct getProduct() {
        //设置不同的组成部分及顺序
        builder.setPart(new ArrayList());
        //返回创建的对象
        return builder.builderProduct();
    }
}