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堡垒纪元2115年，边境部队出身的女少校“位沁”，来到中央堡垒参加天选者选拔，并因暗中追查“边境惨案”而屡遭暗杀。此时，堡垒头号公敌“元一”策动了一场诡谲浩大的反抗行动。一时间，各方势力都被卷入这场行动。AF, focus mode.About Southern Fortune-Copyright Statement-Looking for Talents-Advertising Service-Website Map-Friendship Links-Rights Notice-黄豆对王穷使了个眼色，一边一个扶住他，说已经给红椒送信了，马上就来了。Invoker is the caller (commander), Receiver is the caller (soldier), MyCommand is the command, which implements the Command interface, holds the receiving object, and looks at the implementation code:We can see the above code; Player-to-player coupling code has been removed, However, all logical operations are put into the intermediary object for processing. Any operation of a certain player does not need to traverse to notify other players, but only needs to send a message to the intermediary. The intermediary processes the message after receiving it, and after processing the message, the processing result will be fed back to other player objects. The intermediary mode is used to remove the coupling code between objects. Make the program more flexible.