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/praiseIf 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.《纸房子》第 4 部分在混乱中开始：教授认为里斯本已经被处决，里约和东京炸毁了一辆陆军坦克，内罗毕在生死之间挣扎。该团伙正在经历其最艰难的时刻之一，而敌人的崛起将会把抢劫行动置于严重的危险之中。Imagine that this scarf should be a good accessory in autumn and winter, so keep one for yourself first.They wore thin pajamas, just like waiting for their husbands to return at home. The sign is written in their hearts, word for word, containing how much helplessness and sadness.