Design Pattern-Eleven dumits rule-difficult to handle without acquaintances

Dumit rule)(Also known as the minimum knowledge principle) If two classes do not need to communicate with each other directly, they should not interact directly. If one class needs to call a method of another class, it can be forwarded by a third party.

The premise of the dimit rule is that in the structure design of the class, each class should minimize the access permissions of members, that is, a class should wrap its own private State, do not disclose fields or behaviors that other classes know.

IsThe loose coupling between classes is emphasized.. In program design, the weaker the coupling between classes, the more conducive to reuse. A class with weak coupling is modified and will not affect related classes. That is to say, information Hiding promotes the reuse of software.