工厂类模式提供的是创建单个类的模式，而建造者模式则是将各种产品集中起来进行管理，用来创建复合对象，所谓复合对象就是指某个类具有不同的属性，其实建造者模式就是前面抽象工厂模式和最后的 Test 结合起来得到的。

public class Builder {
    private List<Sender> list = new ArrayList<Sender>();

    public void produceMailSender(int count) {
        for (int i = 0; i < count; i++) {
            list.add(new MailSender());
        }
    }

    public void produceSmsSender(int count) {
        for (int i = 0; i < count; i++) {
            list.add(new SmsSender());
        }
    }
}

public class Builder {
    private List<Sender> list = new ArrayList<Sender>();

    public void produceMailSender(int count) {
        for (int i = 0; i < count; i++) {
            list.add(new MailSender());
        }
    }

    public void produceSmsSender(int count) {
        for (int i = 0; i < count; i++) {
            list.add(new SmsSender());
        }
    }
}

public class TestBuilder {
    public static void main(String[] args) {
        Builder builder = new Builder();
        builder.produceMailSender(10);
    }
}