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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.讲述了善良勇敢的元气少女陆苗，与清冷孤傲的学霸男神江皓月，两人在成长过程中彼此陪伴、相互治愈的爱情故事。Ignoring the cost of icebergs will have one consequence-taking advantage of small gains and eating big losses.严尚书的意思是……生还者的口述，不方便写在军报里的事实，到底有多少人，到底怎么搞的，到底是谁，目的到底是什么。Figure 1其实，那天他是专门去下塘集瞧玄武王的。