What are the behavioral design patterns?

This article will explain in detail what behavioral design patterns exist. The content of the article is of high quality. Therefore, Xiaobian shares it with you as a reference. I hope that after reading this article, you will have a certain understanding of relevant knowledge.

Behavioral design patterns include: 1. Memento, the intention of Memento pattern is to capture the state of an object without destroying the encapsulation;2. Observer;3. Strategy, the strategy pattern enables the algorithm to change independently when used by the user.

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Memento: A Memento object is an object used to store a snapshot of the internal state of another object. Memo mode is intended to capture, externalize, and store the state of an object without destroying the encapsulation, so that the object can be restored to the stored state at an appropriate time in the future

Observer: Defines a one-to-many relationship between objects, whereby when an object changes state, all other related objects are notified and automatically refreshed

Strategy: Define a family of algorithms, package them individually, and make them interactive. Policy patterns allow algorithms to change independently of user usage.

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