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Showing content from https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Package.html below:

Package (Java SE 11 & JDK 11 )

Represents metadata about a run-time package associated with a class loader. Metadata includes annotations, versioning, and sealing.

Annotations for the run-time package are read from package-info.class at the same code source as classes in the run-time package.

The set of classes that make up the run-time package may implement a particular specification. The specification title, version, and vendor (indicating the owner/maintainer of the specification) can be provided when the Package is defined. An application can ask if the Package is compatible with a particular specification version by using the Package.isCompatibleWith(String) method. In addition, information about the actual classes that make up the run-time package can be provided when the Package is defined. This information consists of an implementation title, version, and vendor (indicating the supplier of the classes).

A Package may be explicitly defined with the ClassLoader.definePackage(String, String, String, String, String, String, String, URL) method. The caller supplies the specification and implementation titles, versions, and vendors. The caller also indicates whether the package is sealed. If a Package is not explicitly defined for a run-time package when a class in that run-time package is defined, then a Package is automatically defined by the class's defining class loader, as follows.

A Package automatically defined for classes in a named module has the following properties:

• The name of the package is derived from the binary names of the classes. Since classes in a named module must be in a named package, the derived name is never empty.
• The package is sealed with the module location as the code source, if known.
• The specification and implementation titles, versions, and vendors are unspecified.
• Any annotations on the package are read from package-info.class as specified above.

A Package automatically defined for classes in an unnamed module has the following properties:

• The name of the package is either "" (for classes in an unnamed package) or derived from the binary names of the classes (for classes in a named package).
• The package is not sealed.
• The specification and implementation titles, versions, and vendors are unspecified.
• Any annotations on the package are read from package-info.class as specified above.

A Package can be obtained with the Package.getPackage(String) and ClassLoader.getDefinedPackage(String) methods. Every Package defined by a class loader can be obtained with the Package.getPackages() and ClassLoader.getDefinedPackages() methods.

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