You can uninstall or removes an installed java6-runtime package itself from Debian 8 (Jessie) through the terminal,
$ sudo apt-get remove java6-runtime
If you would like to remove java6-runtime and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove java6-runtime
If you use with purge options to java6-runtime package all the configuration and dependent packages will be removed.
$ sudo apt-get purge java6-runtime
If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.
$ sudo apt-get purge --auto-remove java6-runtime
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