OOP 7 design principles

Principle of single responsibility ： Control the granularity of the class 、 Decouple objects 、 Improve its cohesion .

Opening and closing principle ： Open to expansion , Turn off for changes .

Richter's principle of substitution ： Inheritance must ensure that the properties owned by the superclass are still valid in the subclass .

The principle of Dependence Inversion ： Interface oriented programming , Don't program for implementation .

Interface isolation principle ： To establish them for each class, they need a dedicated interface .

Dimitar's law ： Only talk directly to your friends , Don't talk to strangers .

Synthetic multiplexing principle ： Try to use association relations such as composition or aggregation to achieve , Second, consider using inheritance relationship to achieve