title: How to save and reload a JTree when running a program subsequent times?
body: <p>We have written code for a <code>JTree</code> where we can add and remove nodes dynamically.</p>
  
  <p>However, we cannot save the tree. Each time we run the program, we cannot get the previously created tree.</p>
  
  <p>How can the <code>JTree</code> be saved and loaded?</p>