final modification of a class: class member method can not have children can not be overwritten
A final modification method: This method can not be overridden conflict with the abstract keyword
final modification of a local variable assigned only variables can not be changed once the value of final int num; num = 1;
final data for basic type is unchanged
For the final reference type is an address change
public > prtecte > （defalt） > private
The same class yes yes yes yes
The same package Yes Yes
Buns different classes Yes No
Are different packages already sub-class No No