In the package directive’s absence, those classes and interfaces belong to the unnamed package (the directory the JVM regards as the current directory—the directory where a Java program begins ...

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.

That three percent included packages, methods, and class names. But those declarations—like starting a function with package java.lang —can only be used in certain ways.