java权限修饰符

同包

权限修饰符	当前类	子孙类	外部类
public	√	√	√
protected	√	√	×
Default(friendly)	√	√	√
private	√	×	×

不同包

权限修饰符	当前类	子孙类	外部类
public	√	√	√
protected	√	√	×
Default(friendly)	√	×	×
private	√	×	×

参考

https://www.cnblogs.com/qq1871707128/p/6080189.html