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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.说这是后悔吧？还不是。有人说老子是女人，老子不给他点颜色瞧瞧，那还是黎章么？你不是，肯定不是。"What was your first reaction when you saw these flying insects?" Asked普密斯很难决定是选择欲望还是职责，同时警方会处理相关手续。She is willing to face the war and chaos of life bravely with you and tidy up chicken feathers.As a module, it can selectively expose (provide) its own attributes and methods to other modules for use by other modules.