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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.The following is the prisoner's statement. If the pressure resistance is not good, don't look at it.项羽虽然悲伤，倒也存了几分怜香惜玉之心，说道：妙弋，我没事，你先回去歇着吧。《左邻右舍》体验不一样的邻居生活。左右的邻居。比喻关系比较接近的其它单位。【解释】左右的邻居 。相近的人。体验不一样的邻居生活Number of plaintiffs: unknown讲述Daimon及Ana Helstrom是一个神秘﹑强大的连环杀手后裔，在漫画中Daimon和妹妹Satana实际上是撒旦的孩子，Daimon拥有恶魔的能力，而且可穿梭地狱。此剧由Paul Zbyszewski及Jeph Loeb负责。