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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."Apart from Jiang Yong, is there anyone else injured or sacrificed as a result of this attack?" I asked.中华成语故事这部动画片可以帮助孩子更好的学习成语。The simulation is shown in the following figure多次获得“最有价值独立公关人”殊荣的业界高手卫哲，人脉强大手段百出，风采不凡情商高。而临危受命的公关新人江达琳，天性耿直且嘴炮力Max，智商高实战强，是有潜力的行业清流。两人组成“公关合伙人”，与时间赛跑联手征战危机，揭开热点新闻背后。HBO宣布续订《副总统》第七季，将于2018年回归。说完，依旧用心诊脉。