Re: Timeout question on a socket thread

Eric Sosman <>
Thu, 30 Jul 2009 12:37:47 -0400
RVic wrote:

But say I declare something as final, and initialize it to null in the
declaration (so I can access it in y finally block), can I
subsequently assign it
final OutputStream output = null;
    try {
      output = socket.getOutputStream(); //is this legitimate?
     output = null; //is this legitimate?

     No: The `final' variable cannot be assigned to after initialization.

     You've snipped away so much context (all of it) that the original
problem has been lost, but it seemed that you had a variable that
needed to be non-final because there were multiple assignments to it,
but simultaneously needed to be final because you wanted to use its
value inside an inner class. A solution is to use *two* variables,
one non-final (which you can change as often as you like) and one
final (which you'll initialize with the value of the first once you've
made up your mind):

    Answer answer; // non-final
    // ... lots of code that assigns to `answer', changes its mind
    // and assigns a different value, uses a lifeline and assigns
    // yet again, dithers back and forth a bit, and eventually
    // decides that `answer' is the Final Answer ...

    final Answer finalAnswer = answer;
    button.addActionListener(new ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent e) {
            // ... code that uses the value of `finalAnswer'


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