title: Can I make a variable final after it has been declared?
body: <p>I'm making a banking model, and an Account class has an accountNumber field. The account number should never change, but I cannot set the field as final because this will prevent the constructor from setting it.</p>
  
  <p>If it's not possible to do this, it doesn't matter. It's just for a CS assignment so I want to make sure I'm doing it the best way I can.</p>
  
  <p>Would the best implementation be to just make the field and its setter method private?</p>