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理论告诉我们权力越大,责任也越大;In the specific life cycle, the method to find the user's characteristics, in addition to building a data model, is to analyze the user's characteristics, which can be divided into two types: refinement and scenario, as shown in the above figure.The template method pattern consists of two parts, The first part is the abstract parent class, The second part is the subclass of concrete implementation. Generally, the abstract parent class encapsulates the algorithm framework of the subclass, including implementing some common methods and encapsulating the execution sequence of all methods in the subclass. The subclass can inherit the parent class and rewrite the methods of the parent class in the subclass, thus realizing its own business logic.1. The above definition of bit number partition is adopted in the new design phenotype, thus gradually standardizing it.Another expression of the minimum knowledge principle is to communicate only with direct friends. As long as there is a coupling relationship between classes, it is called a friend relationship. Coupling is divided into dependency, association, aggregation, combination, etc. We call classes that appear as member variables, method parameters, and method return values direct friends. Local variables and temporary variables are not direct friends. We require unfamiliar classes not to appear in the class as local variables.Hello, I am very happy to answer for you!