You can uninstall or removes an installed libgcj16-awt package itself from Ubuntu 17.04 (Zesty Zapus) through the terminal,
$ sudo apt-get remove libgcj16-awt
If you would like to remove libgcj16-awt and it's dependent packages which are no longer needed from Ubuntu,
$ sudo apt-get remove --auto-remove libgcj16-awt
If you use with purge options to libgcj16-awt package all the configuration and dependent packages will be removed.
$ sudo apt-get purge libgcj16-awt
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 libgcj16-awt
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