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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.全福人依旧是汪氏。Reference　　李钟硕将加盟朴勋政执导新片[VIP]。故事讲述朝鲜某高官儿子在世界各国连续杀人，韩朝两国警方以及国际刑警对其进行追捕。李钟硕在片中饰演被追捕的连环杀人犯，这也是欧巴首次挑战反派角色。在最新电视剧《W-两个世界》杀青后，他将进入剧组进行拍摄。3. In the case of cross encounter, when the motor boat takes actions in accordance with subparagraph (2) of paragraph 1 of this Article to avoid collision with another motor boat, if the circumstances permit at that time, the boat on the port side of the boat shall not turn left.尼克是维克托在教堂偶遇的新朋友，这一季主要讲述了尼克和维克托之间的故事。看向黎章，只见他双手抱胸，笑眯眯地望着自己，可是眼底却毫无笑意，倒满是杀意。