title: What is the use of setFocusTraversalKeysEnabled()?
body: <p>I was confused to what the purpose of adding a <code>setFocusTraversalKeysEnabled</code> in the constructor of class that extends a <code>JPanel</code> and implements <code>KeyListener</code>.</p>
  
  <p>What is the use of <code>setFocusTraversalKeysEnabled()</code>?</p>