Java Learning Notes-access rights for different packages

Focus:

1. Only private ones in the same package cannot be accessed by another class, and only private ones cannot be inherited

2. Subclasses different packages have no relationship to the two classes, only public members of the public class can be accessed by classes in the other package

3. Among the two classes in which the different packages are concerned about inheritance, only public members and protect members of the public class can be used internally by subclasses of the other package, but outside the subclass, only the public members of the parent class are accessible through the subclass object name

Java Learning Notes-access rights for different packages