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2. The ID card of the handling person (one copy of the front and back is stamped with the official seal)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.This.value = memento.getValue ();There is a male friend around him who likes a girl very much. They have been good friends for many years. He has considered for a long time and also thought about the consequences of the confession. But in the end, the boy still confessed. Although rejected, he is still a friend. The girl's idea is that being a friend will never be lost. She believes that only friends can last a lifetime. In fact, the boy also struggled for a while. He didn't know what kind of attitude he should use to face the girl after being rejected. I was also worried that their relationship would be far less than before. As both of them were optimistic and cheerful and had a deep friendship, they were still as good as before. Emotionally, boys and girls may have very different ideas. If the girl's confession is rejected, she may not continue to be friends unless the girl is open-minded enough. I remember that I supported this friend's confession very much at the beginning and wanted to help match it up for a time. From the perspective of boys, it is not easy for a person to meet a person he really likes all his life. If he does not try to stay, he will definitely feel sorry in the future. From the perspective of girls, how lucky it is to meet a person who is so kind to himself. But emotional things can never be forced.The learning platform launched on that day is called "Learning Power". No matter from the time node, the attendees or even the names of the platform, it obviously has a very heavy weight.