title: Distinct column values in csv file
body: <p>I have a csv file.
  columns in csv file - "SNo. StateName CityName AreaName PinCode NonServ.Area MessangerService Remark".
  The column CityName has repeated values.</p>
  
  <p>Ex: In many records, it has unique value (Delhi).
  Is there any approach in java to read that csv file and get the distinct values from that column of the csv file.</p>