What is the relationship between a package and its subpackage in Java? [duplicate]

Question

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Java: Subpackage visiblity?

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Question Is there any relation between two packages: odp.proj and odp.proj.subpackage?

Someone tried to answer it here but failed to describe it.

Answer 1

No, there's no relation between odp.proj and odp.proj.subpackage from the Java language perspective.

For code, odp.proj.subpackage would reside in a sub directory of odp.proj, and some tools and IDE's might group them together in a UI, but regarding language access control, or other langage feature there's no relation.

Java does not have the concept of a subpackage, so odp.proj.subpackage and odp.proj are as different from each other as any other differently named packages.