title: How to update JLabel in Swing?
body: <p>I am trying to use Swing Timer and I wanted to start from a very simple program. I have a window with text: "You have n seconds", where n changes from 10 to 0 every second.</p>
  
  <p>I know how to generate a window with text. And I understand how Timer works (it starts an action periodically). But I cannot figure out how to combing this two things. Should I use that: <code>JLabel label = new JLabel(myMessage);</code> and then with timer I need to update the "myMessage" variable?</p>
  
  <p>But I think I need to "force" my window to "update" itself (to display a new value stored in "myMessage").</p>