Permission modifiers for Java (public,protected,default,private)

　Access modifier permissions from high to low are public, protected, default, Private.

First, according to "whether is the same package", "whether is sub-category" divided into 4 cases + 5 cases of this type

　　　　

Second, the sub-class in the same package and non-subclasses in the same package are merged into the same package

Access modifiers	This class	Same package	Different packages, sub-categories	Different packages, non-subclasses
Public	√	√	√	√
Protected	√	√	√
Default (Friendly)	√	√
Private	√

Permission modifiers for Java (public,protected,default,private)