Declare data members private. It gives clients syntactically uniform access to data, affords fine-grained access control, allows invariants to be enforced, and offers class authors implementation flexibility.
protected is no more encapsulated than public.
protected is no more encapsulated than public.
原文链接: https://www.cnblogs.com/zhtf2014/archive/2011/03/27/1997181.html
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