Description: The observer pattern (Observer) will be the perfect the observer and the observed points out. For example, the user interface can be used as an observer, the business data is observed, the user interface to observe the change of business data, find the data changes, is displayed in the interface.
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4.观察者模式\Client.java
............\ConcreteWatched.java
............\ConcreteWatcher.java
............\Watched.java
............\Watcher.java
4.观察者模式
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