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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.她说着话，手里兀自不停地穿针引线。电视动画《怪人开发部的黑井津》改编自水崎弘明原作同名漫画作品，于2021年7月7日相关报道动画化决定。Proportion of patients who obtained MDT diagnosis and treatment advice at MDT meetings.本剧将于2014年06月29日登陆湖南卫视《青春星期天》，每周日晚22：00倾情呈现，芒果TV全网独播[2] 。The customers developed by the new salesman must be those who have real needs for the products. They must do a good job in relevant services so that the customers can have good trust in you and your products. This customer is your network. With the help of the customer's resources, you can try to let him introduce you to some customers who have needs and intentions. You can also use the customer's products and publicize your own products through his word of mouth.