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It turned out to be really a low-level mistake. . . And this low-level mistake also shields the real anomaly.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.As a result, an exception occurred when newChannel was used, and a FailedChannel was returned after catch, while the outside call thought that it must be a DatagramChannel.　　军管会社会部主任罗江，接到命令，迎接投诚的国民党第七集团军少将情报官何应农。何应农带来了《东北战区国防战略计划书》，也就是整个东北地区国民党军队的兵力部署以及战略计划。这份战略情报将决定整个东北战局的命运。If CSO's of major banks in the country are asked about distributed denial of service attacks (DDoS) they have encountered in recent months, they will certainly keep their mouths shut. Yes, silence is the first choice for security personnel.Add VOLUME directive: