java设计模式(-)

(1)普通工厂模式
建立一个工厂类，对实现了同一接口的类进行实例创建

 class Factory{
    public Sender Send(String type){
        if(type.equels("XXX")){
           return new MailSender();
        }else if(type.equels("XXX")){
           return new SmsSender();
        }......
    }
   }

   Factory factory = new Factory();
   Sender send = factory.Send("mail");

(2)多个工厂方法模式
对普通的工厂模式的改进，避免type传入出错

 class Factory{
    public Sender MailSend(){
        return new MailSender();
    }
    public Sender SmsSend(){
        return new SmsSender();
    }
   }

   Factory factory = new Factory();
   Sender send = factory.MailSender();

(3)静态工厂模式
上面Factory的方法全部改为static
Sender send = Factory.MailSender();