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Continue to more, I heard that the difficulty of purgatory is finally going to be updated, so I just said two words.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.Private Vector < Observer > vector = new Vector < Observer > ();人物关系Girls who are afraid of the cold in winter and like to wear pantyhose must have a deep understanding. Because they are not close enough, socks are often stacked on their calves, forming ugly folds. What is more embarrassing is that because they are too thick, it is difficult to put their feet into shoes.Rich Inside:Aom和Mike的缘分并不止于此。回国后，Aom得知自己房子已被转卖，房子的新主人正是不打不相识的大明星Mike。因为种种阴错阳差，二人协议结婚并住在同一屋檐下，发生在Full House里的浪漫爱情故事，悄然酝酿。