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It is mainly used to reduce the number of objects created to reduce memory footprint and improve performance. This type of design pattern belongs to structural pattern, which provides a way to reduce the number of objects and thus improve the object structure required by application.Services: Functions provided by the system that users will benefit from in their use. 泰剧《都市游戏之隐匿之爱》是由泰星Son和Bee主演的剧集。两位也是继《新三世情缘》之后，再次牵手合作。在《新三世情缘》剧中，Son和Vill女神饰演一对情侣，而Bee则饰演一位非常喜欢Son的恶毒女二。这次在《都市游戏之隐匿之爱》剧中，Bee终于可以跟Son光明正大地演一对情侣啦！水军，都是水军。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: