本文深入探讨了行为设计模式中的一种——观察者模式，详细解析了观察者模式如何定义对象之间的通信，即可观测对象和观察者。以新闻机构为例，当它接收到新闻更新时，会通知所有订阅的频道，这一过程展示了状态变化触发的通知机制。
练习源码：https://github.com/liaoooyx/Design-Patterns
来自：https://www.baeldung.com/java-observer-pattern
Observer is a behavioral design pattern. It specifies communication between objects: observable and observers. An observable is an object which notifies observers about the changes in its state.
For example, a news agency can notify channels when it receives news. Receiving news is what changes the state of the news agency, and it causes the channels to be notified.
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