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经典爱情千古流传，悲喜交织张力十足。1. Fix several bugs;The above design error stems from confusing the hierarchical structure of "role" with that of "person" and mistaking "Has-A" for "Is-A". The specific solution is to abstract a role class:梁子是凯星服装店的售货员，由于他待客热情，微笑服务，受到了商店同事和郭经理的好评，而他心里却一直梦想当一名电影演员。一天，卖油饼的晓晴姑娘告诉梁子，电影明星速成班正在招生，梁子不由喜出望外。考场上，梁子遇上了也来参加考试的幼儿园老师张玲玲。TCP works in the Transport layer, IP in the Network layer, and ARP in the DataLink layer; The data on the second layer is called Frame, the data on the third layer is called Packet, and the data on the fourth layer is called Segment. At the same time, we need to simply know that when data is sent from the application layer, header information will be added to each layer, encapsulated, and then sent to the data receiving end. This basic process you need to know, that is, every data will go through the process of data encapsulation and unencapsulation.