java.lang: A collection of language-related classes, such as Object and String, organized in the java package’s lang subpackage; java.lang.ref: A collection of reference-related language classes ...

I intentionally included three attributes in the MANIFEST.MF example above that are not accessible from Java’s Package class. These are Package-Title, Package-Version, and Package-Vendor.

Strictly speaking, it isn't possible to list the classes in a package. This is because a package is really nothing more than a namespace (eg com.epicapplications.foo.bar), and any jar-file in the ...