title: How to read the file, put data in JTable, then modify cell/delete lines and save data to the file?
body: <p>I need to read the date from the .txt file put it into JTable in my GUI, then modify some records or delete some lines and save new data to the file. 
  I can do the reading and show JTable but how to edit the date or delete some lines in JTable using GUI then save it to the file?</p>