title: Apache POI - Iterate Down a Single Column
body: <p>I'm still new with POI, but I want to simply iterate down a single column in an Excel Workbook.  For instance in the table below if I just want the values of column A, which would be the rows 0-3 in column 0, is there an efficient way to do this?  Everything with POI I have seen has been very row-based.</p>
  
  <pre>____A__________B______
  1| some   |   some   |
  2| sample |   other  |
  3| text   |   stuff  |
  4| here   |   here   |
  ______________________
  </pre>
  
  <p>I have a few spreadsheets that can be large, and I successfully can iterate through the whole sheet, but I'm just trying to figure out the best practice for handling something like this.</p>
  
  <p>Thanks in advance.</p>