title: How to display group by data in jtable in java swing?
body: <p>I want to display data in GroupWise, there are this type of field in java swing jtable as shown in picture.</p>
  
  <p>How to do that?  </p>
  
  <p><img src="https://i.stack.imgur.com/PAKSy.png" alt=""></p>