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System.out.println ("observer2 has received! ");Printing the screenshot above, we can see that the subscriber receives every message from the publisher. However, for Xiao Hong, she only wants to receive messages with red color and does not want to receive messages with black color. Therefore, we need to make the following modifications to the code. We can first add a key so that the subscriber can only subscribe to messages of interest to herself. The code is as follows:Now, she has to lie in bed all day long, and she can already start walking downstairs or cooking breakfast for herself. "When I cooked my first meal again, I felt full of accomplishment. After eating, I didn't even have time to put chopsticks on the plate, so I climbed onto the bed and passed out. As tired as just running two marathons."众人哄笑。So the result is? []故事背景是以1950年共和国成立之初，解放战争的硝烟尚未散尽，我军某大军区高层突然接到紧急命令，在该军区内立即挑选一批身经百战、身怀绝技的战斗英雄，组建一支执行绝密任务的特殊小分队。任务是秘密潜入情况复杂的广西梧州、以及西江一带，接应国民党投诚的一位情报高官，并不惜一切代价，将他所携带的，关系到新中国党和国家安危的绝密文件，秘密护送回北京。