Thank you very much @amosbastian for reviewing my work.

Is there a reason you are calling the API yourself and not using a wrapper (not sure if there is one for Java)?

Yes you are right.
There is one named SteemJ which provides many functionalities.
Since we are using SteemConnect for most of the purpose,SteemJ is a large library, so taking use SteemJ for small calls will be infeasible. Hence we decided to make plain Http call.

Also, was curious why your tab size is so large? It makes the code very wide and less readable (in my opinion).

Actually my Studio IDE had an incorrect editorconfig. Due to which i was getting correct view here but when i pushed the code, it changed there on GitHub.
I assure to rectify it in the next update.