Returning column name from table in SQLite using Java GUI

I need to get column names from table, only difference is that I made a function that makes new columns depending on users entry in txtbox. So for example if a user enters "3", column would be named "column_3". Now when you saw that example I need to make a query that returns column names for my combobox (all column names have something in common, and thats "column_", but I have other columns too, not only ones that have "column_" inside their name ).

My Interface: http://ift.tt/1BTjHZu When i press "Ok" this is code behind it: http://ift.tt/1OMVspZ