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新世纪的钟声已经敲响，蓦然回首，我们发现在硝烟弥漫的商战中，人类的良知与正义是那样的可歌可泣。If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza. 　CBS已续订《极品老妈》第四季。Since UDP is not a connection protocol, it has the advantages of low resource consumption and fast processing speed. Therefore, UDP is usually used more in audio, video and ordinary data transmission, because even if they occasionally lose one or two data packets, they will not have much impact on the reception results. For example, ICQ and QQ we use to chat are UDP protocols.1976年的一个夏天，三十六颗炸弹在克里夫兰市里被引爆。当时，爱尔兰黑道分子丹尼·格利因正如火如荼地和意大利黑帮进行一场地盘争霸战。Shenhu Bay热血网友巧妙剪辑而成的彩虹小马之狂派金刚来袭篇。