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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.青龙影视肯花费如此代价宣传，那么真相只有一个。最终，潘卓华按照父母之命同门当户对的方宝琦（李诗韵 饰）结为夫妻，然而，他的心中却依然留存着对于叶向晴的爱恋。巧合的是，方宝琦对于自己的婚姻亦十分不满，因为她真正爱着的是小混混关浩长（萧正楠 饰）。与其说魏无忌是被淹死的，更确切的说是魏王逼死的。刘邦现在完全就是得过且过，心灰意冷，借酒浇愁。　　直到夏日某一天的黄昏时分，小镇一个宁静的区域陷入了恐慌。人们毫无预兆、毫无理由地晕倒，任何试图进入该区域的人也会遭遇同样的情况。