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Frangula alnusIn the previous example of electric lights, a state mode program was completed. First, the Light class is defined, which is also called Context here. Then in Light's constructor, to create instance objects for each state class, Context will hold references to these state objects in order to delegate the request to the state objects. The user's request, that is, the action of clicking button, is also implemented in Context, with the following code:三更求粉。TCP is connection-oriented, and a connection must be established between either side before sending data to the other. In TCP/IP protocol, TCP protocol provides reliable connection service, and the connection is initialized by three-way handshake. The purpose of the three-way handshake is to synchronize the serial numbers and acknowledgement numbers of both parties and exchange TCP window size information. The process of shaking hands can be represented by the following figure　《扑通扑通放送事故》讲述了在新冠肺炎时代突然火起来的直播带货公司里发生的一系列故事。这个丞相真是重臣贤能，细致周到啊。浙江、南直大明水师势大，倭寇已无所劫。