考虑到这些应用, 比较合适的就是 Observer (观察者) 模式, 不仅可以动态的加入/移出观察者, 也能够让线程类 (Core) 和显示类 (UI) 之间脱耦. 可谓一举多得. 于是我就试着写了个线程搜索路径下所有文件的例子, 在其中应用了 Observer 模式.-Decoupling between the consideration of these applications is more appropriate Observer (Observer) mode, not only can dynamically added/removed　the viewer, but also allow thread class (Core) and display type (UI). Has multiple purposes. So I tried to write an example of all the files in the search path of the next thread in which the application of the Observer pattern.