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The first type is implemented through the relationship between the parent class and the child class. The second category: between the two categories. The third category: the status of the class. Category 4: Through the intermediate categoryTherefore, learning design patterns, The first thing to do is to understand which aspects of design patterns are available to developers, Then, the principle, timing and method of each design pattern are studied respectively, that is to say, under what circumstances should a certain design pattern be used? When understanding the timing of a certain design pattern, it is also necessary to understand what consequences will be caused if this design pattern is not used at this time. After understanding the principle and usage of each pattern, more importantly, learning the object-oriented thinking mode, after mastering the object-oriented thinking mode, looking back at the design pattern, you will have a deeper understanding. Finally, learning the design pattern, you must study hard and practice more. "I agree with the last sentence very much."Smsto://: SMS data format, followed by SMS receiving number.哈佛大学宗教符号学教授罗伯特·兰登（汤姆·汉克斯饰演）到巴黎公干期间突然接到通知罗浮宫馆长遭人谋杀，而在博物馆内，尸体旁边留下了一个令人困惑的密码。兰顿教授与法国美女密码专家苏菲（柯德莉·塔图饰演）在整理分析谜团的过程中，惊讶地发现在达芬奇的作品中藏有一连串令人震惊的线索。这些线索人人可见，却被画家巧妙地伪装，加以隐藏。电视剧《危险二人组-K2- 池袋署刑事课神崎・黑木》的番外篇，主人公为杰西饰演的青年刑警诸星一朗。HorseUnconnected queue: In the three-way handshake protocol, the server maintains an unconnected queue that opens an entry for each client's SYN packet (syn=j), which indicates that the server has received the SYN packet, sends a confirmation to the client, and is waiting for the client's confirmation packet. The connection identified by these entries is in Syn_RECV state on the server. When the server receives the confirmation package from the customer, the entry is deleted and the server enters ESTABLISHED state.