Java Coding Specification

Learn Java for a few months, has been to public,private,protected,static,final keyword and with each other not too concerned about, today read the "Java Security coding standards" only to find the severity of the problem.

Code that does not conform to the rule:

A data member of the underlying data type of public (common). Should be changed into private form.

Public mutable data members should be written to provide wrappers and reduce accessibility to mutable data members

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Java Coding Specification