Package Access Protection
Classes within a package can access classes and members declared with default access and class members declared with the protected access modifier. Default access is enforced when neither the public, protected nor private access modifier is specified in the declaration. By contrast, classes in other packages cannot access classes and members declared with default access. Class members declared as protected can be accessed from the classes in the same package as well as classes in other packages that are subclasses of the declaring class.
Read more about this topic: Java Package
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