Public, protected, internal, and private cannot be the same!

Maybe some new users do not pay much attention to the use of access modifiers in the initial stage of programming, but after the "creation" error, I think most people will take it as an example and pay more attention to it!

The incorrect access modifier may not cause syntax errors of the program, but may cause potential runtime errors, more importantly, it damages the information security of the class (that is, it violates the encapsulation principle) and adversely affects the class members.

Summary:

Public: we can hold a press conference to show off our capital to the masses;

Protected: internal discussions within the team;

Internal: company, organization, foundation... internal communication;

PRIVATE: "I will not say it !" -- Movie "Party A"

What is the difference between code and life and work ?!