title: How to merge cell in DefaultTableModel/JTable?
body: <p>I searched a lot and got some answers for this Q. but many of them referred to links which give 404 error.
  I want to make table like this:</p>
  <p><img src="https://i.stack.imgur.com/QMBO6.png" alt="No. of cells to be merged is not fixed" /></p>
  <p>Is there any method in java for this?</p>