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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.Creating subscribers takes some time and memory.这是关于一群生活在都市中男男女女的爱情故事，他们因为种种机缘深陷于情感的漩涡，上演着一出出犹如无人驾驶般横冲直撞的燥动与狂乱。　　这12名陪审员互不相识，但按照规则，他们必须达成一致，才能结束审判。第一轮投票，就有11人认定“富二代”有罪，所有人证物证都指向这一结果的情形下，这位年轻的嫌疑犯离舆论上的死亡只有一步之遥。所有的线索都被逐一讨论，随着审判的进行，疑点出现，每个人背后的故事也浮出水面……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:Equipment: Increases the critical strike level by 20 points.