title: A JTable where number of columns in each row may be different
body: <p>I am looking for a solution for a JTable where I can vary the number of columns in each row, but where the size (in pixels) of the row is constant. </p>
  
  <p>I found stackoverflow referencing so far only dead-links to an old solution:</p>
  
  <p><a href="https://stackoverflow.com/questions/4147843/jtable-with-varying-number-of-columns-per-row">JTable with varying number of columns per row</a></p>
  
  <p>Is there a newer better way to do it now ? 
  If so, what?
  If not, does anyone know what the old solution was?</p>
  
  <p>thanks. </p>