| # Package Version Identification | Documentation Contents

> The versioning feature enables package-level version control so that applications and applets can identify at runtime the version of a specific Java Runtime Environment, VM, and class package.

## Package Versioning Specification

- Versioning Specification (HTML, PDF)

## API Reference

- java.lang.Class
- java.lang.ClassLoader
- java.lang.Package
- java.lang.System

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