title: Java tree with columns
body: <p>I have a task to create java tree, with three columns: Sport name, Count of sports which are in sport category, and last update. Something similar is dispayed on image bellow:</p>
  
  <p><img src="https://i.stack.imgur.com/Yd4w8.jpg" alt="Design of JTree"></p>
  
  <p>As you can see, there are 4 kinds of sports: Water, Ball, Skying, Dancing. When I expand skying, there are 3 sports of its kind. </p>
  
  <p>But how to make columns. I can make JTree with nodes and stuff, but how to add columns?</p>