title: Color cells in a column in a JTable
body: <p>I currently have a JTable consisting of 7 columns and many rows of data.</p>
  
  <p>How would I go about colour each cell in the 7th column? I want to colour according to the data inside the cell. </p>
  
  <p>So if one of the cells in the 7th column was say below 0, then I want to colour red or if one of the cells in the 7th column was more than 0, then colour green etc.</p>
  
  <p>Thank you</p>