The article introduces ‘jenv’ as a tool similar to nvm for managing multiple versions of Java Development Kits (JDKs). To install ‘jenv’ on a Mac, users can use Homebrew with the command ‘brew install jenv’ and verify the installation with ‘jenv –version’. Users can then add JDK versions to ‘jenv’ and switch between them using commands like ‘jenv versions’, ‘jenv global’, and ‘jenv local’.