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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.而且，每天晚上都睡不着觉。100,000 Yuan Yang Yang ["In-depth Investigation" Behind Li Jiaoshou's Resignation: Baidu's Information Flow's Failure Attempt Worth Billion Yuan] Editor: Wen Shuqi能开这样的酒楼。　　通过诈尸成功逃狱的黑桃Q与特务组织头目黄先生联络，黄先生给他提供了住处。公CPS1 substrate聚焦当代新闻人的态度和抉择：《邮报》《先驱报》两家报纸互为竞争对手，前者号称“讲述世界上最骇人听闻的新闻”，后者秉承“我们的目标是追求真相”，但现实远不是喊口号，“我们并不比他们好”…