One problem with the factory method pattern is that the creation of the class depends on the factory class, that is to say, if you want to expand the program, you must modify the factory class, which violates the closure principle. Therefore, from the design point of view, there are certain problems, how to solve them? We use the abstract factory mode to create multiple factory classes, so that once new functions need to be added, we can directly add new factory classes without modifying the previous code. Because the abstract factory is not very easy to understand, let's look at the diagram first, and then it is easier to understand with the code.
《白粉飞 Snowfall》第四季确定在美国时间明年2月24日作两集首播，本季共10集。
所以没有发声，依旧保持着倾听。
…,张良听着郦食其侃侃而谈，心头不禁浮现出一丝隐忧。
我和妹妹两个人住，谁想他突然出现并成为“爸爸”，这个男人到底怎么了...？
Family name: Polygonaceae Polygonaceae
Whether it is file uploading, music or video players, some obvious state distinctions can be found. For example, there are several states in the file upload program: scanning, uploading, pausing, uploading successfully and uploading failed. The music player can be divided into several states: loading, playing, pausing and playing after. When clicking the same button, the behavior in upload and pause states is different, and their style class is also different.
I. TCP Handshake Protocol
Circulatory system
Link to this article: Scratch2.0 Programming Tutorial Section 6: Event Module
刘邦无奈道：韩元帅，征讨河北需要的兵力也不少吧？若是两线作战的话，我军的兵力只怕是会吃不消，何况南方还有一个越国蠢蠢欲动。
The competent doctor should inform the patient or family members of the purpose of MDT discussion, the members attending the meeting and the results of the discussion within a certain time limit.
《Tracer》是一部讲述空降到对某些人来说比法官和检察官更可怕，又名为"垃圾场"的国税厅租税5局的狠毒家伙，不顾一切驰骋的痛快追踪打斗剧。
讲述了章台市一起千万元公款挪用大案侦破过程。表现了新任代理市长的励精图治、市委书记的沉着冷静，使得副省长的问题终于被揭开。作品主题积极向上，宣扬了人间正气，抒发了积极向上的乐观精神。清气澄余滓，杳然天界高。血色深沉的思想主题，豪放苍劲的艺术表现，撞响了反腐肃贪的警世洪钟。
/v fol-Follow Me
A: If you achieve two achievements in 25 people, you can start. First, "draw firewood from the bottom of the kettle! 25 people battle Tangmen", 2, "rescue four Tang! 25 people battle Tangmen"
The man not only competed for the house, but also for the custody of the children. But he was not satisfied. He continued to appeal for the only reason for the last car.
Reference: Baidu Encyclopedia-Civil Aviation Pilots
天启不是说，这部小说就是写玄铁重剑，现在玄铁重剑怎么就这样熔了？而且，这个神雕大侠杨过是什么鬼？玄铁重剑明明是独孤求败的兵器，好不好？文小桃感觉整个人都迷糊了。
