title: Making a JPanel manually resizable
body: <p>I have a <code>JFrame</code> with <code>BorderLayout</code> as the layout manager. </p>
  
  <p>In the south border, I have a <code>JPanel</code>, I want this <code>JPanel</code>'s size to be adjustable by the user, i.e. the user can click on the edge of the border and drag it up to make it larger.</p>
  
  <p>Is there any way you know that I can do this?  </p>