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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.Require.extensions to see support for the three filesWhen you click on the character with the mouse, he will also talk to you: "Hello, I'm Mark, shall we go for an outing together?" .因一次飞机上的意外，一个掌握惊人解锁技巧的冷漠男人引起了女刑警秦左漫的注意，在一次诡异的密室杀人案件中，秦左漫意外发现他竟是公安大学新聘请的安全专家木夏。随着千奇百怪的密室案不断涌现，一根筋的“大小姐”秦左漫、闷骚的“技术宅”木夏、脱线的“网红”小警察谭佑，这支欢喜冤家三人组，一次次迎接不可能的挑战，一一开启上锁的房间，而被锁闭的真相也被逐渐揭开……When we were young, chasing girls, the older ones told us the experience of being bold, careful and thick-skinned. In fact, doing business is like chasing girls.奥利弗（约翰·霍华德·戴维斯 John Howard Davies 饰）一出生就被抛弃，在孤儿院生活了九年之后，他被送到了棺材铺当学徒。无法忍受苦不堪言的生活，奥利弗从师傅的身边逃跑来到了巴黎，在那里，他结识了扒手法钦（亚利克·基尼斯 Alec Guinness 饰）。就这样，奥利弗被迫开始了自己的扒手生涯。此时，这张稚气的脸上却透出凶狠的神情。