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Explain that in the OrderPizza method, we do a lot of things, including calling the CreatePizza method to generate a desired pizza, and then doing a series of operations on the pizza. The key point is that Pizza is defined as an abstract class, which means that in the OrderPizza method we don't care what type this Pizza is at runtime, in other words, this is decoupling. The coupling between PizzaStore and Pizza is uncoupled.Key Issues Faced by Online Organizations:The multi-Reactor thread mode divides "accepting the connection request from the client" and "communicating with the client" into two Reactor threads to complete. MainReactor completes the operation of receiving the client connection request. It is not responsible for the communication with the client, but transfers the established connection to the subReactor thread to complete the communication with the client, so that the following client connection request will not be processed immediately due to the large amount of read () data. In addition, the multi-Reactor thread mode can also distribute massive connections to multiple subReactor threads by implementing the subReactor thread pool under the condition of massive concurrent requests from clients, which can greatly improve the application load and throughput in a multi-core operating system.Similarly, the popularity of spokesmen will also have a process of sprouting, growing, flourishing and declining. When enterprises look for celebrities to speak for themselves, they often choose spokesmen at the peak of popularity in terms of brand building and popularity building.System.out.println ("update self! ");林兄弟是在下救命恩人，在下要跟他叙旧。此时汉王刘邦正坐在宫殿里。