What is the difference between package private public protected

Question

Are there rules to on when to use which access specifier for the package?

Answer 1

Modifier	Class	Package	Subclass	World
Public	Y	Y	Y	Y
Protected	Y	Y	Y	N
No modifier	Y	Y	N	N
private	Y	N	N	N

 

Public: Any package, any class accessibility is available

Private: Access is not available outside the class

Protected: When an attribute of a method is declared as protected then it is visible to all the classes in the same package and all subclasses in different package