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Visitor pattern decouples the data structure from the operations acting on the structure, making the operation set relatively free to evolve. Visitor pattern is suitable for systems with relatively stable data structure and easy change of algorithm. Because visitor mode makes it easy to increase algorithm operation. If system data structure objects are easy to change and new data objects are often added, visitor mode is not suitable. The advantage of visitor mode is that it is easy to add operations, because adding operations means adding new visitors. Visitor mode centralizes the relevant behaviors into one visitor object, and its changes do not affect the system data structure. Its disadvantage is that it is difficult to add new data structures. -From EncyclopediaJava is a typical object-oriented programming language, so this tutorial is based on Java to explain these 23 design patterns. If you don't know Java, please hit the "Java Tutorial" to learn.The observer mode defines a one-to-many dependency relationship, allowing multiple observer objects to monitor a certain topic object at the same time. When the state of this topic object changes, all observer objects will be notified so that they can automatically update their behaviors. The specific structure diagram is as follows:The following are the data:尤其是出门的时候正好遇到蒲俊，更是害羞不已，一溜烟跑到了营地旁的小河边。帶你遊走人際關係的邊緣，慘劇成因究竟係乜？ 人與人之間嘅疏離、冷漠、無視，一一成為幫兇！ 世界每一個角落，惡性循環不斷，人類幾時先肯改過.