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As the server's network equipment, routers, switches and other infrastructure have a certain upper limit on the processing capacity of data packets, when the arriving data path packets exceed the corresponding upper limit, the problems of network congestion and slow response will occur. Attackers can use this feature to control a large number of hosts to send data packets to the target machine, causing network equipment to be busy, making normal requests unable to be responded to in time, resulting in denial of service.The code check includes and is not limited to the above list. The author should complete the code format, architecture design, object-oriented analysis and design checks locally.This class can meet the basic requirements, but if we put a class like this without thread safety protection into a multi-threaded environment, there will definitely be problems. How to solve them? The first thing we think of is adding the synchronized keyword to the getInstance method, as follows:定于今日辰时在西华门外军营大校场招收女兵。我是徐海。D (sender, e);路四林为了拿回自己的东西，四处打听，最后得知钢蛋已经前往笨贼的窝点。