Re: Itchy problem

From:

"printdude1968@gmail.com" <printdude1968@gmail.com>

Newsgroups:

comp.lang.java.help

Date:

9 May 2007 12:33:08 -0700

Message-ID:

<1178739188.684836.23650@e51g2000hsg.googlegroups.com>

On May 9, 4:21 pm, Ravi <ra.ravi....@gmail.com> wrote:

import java.io.*;

class DataIO {
        public static void main(String args[]) {
                FileOutputStream f;
                try {
                        f = new FileOutputStream("test");
                } catch (FileNotFoundException fe) {
                        System.out.println(fe);
                        System.exit(1);
                }
                DataOutputStream d = new DataOutputStream(f);
                try {
                        d.writeDouble(7.6d);
                        d.writeFloat(90.9f);
                        d.writeChars("Ravi");
                        d.close();
                        f.close();
                } catch (IOException ioe) {
                        System.out.println(ioe);
                        System.exit(2);
                }
        }

}

Gives the error:
  DataIO.java:12: variable f might not have been initialized
                DataOutputStream d = new DataOutputStream(f);
                                                          ^

How to resolve this problem.

I think the key to this is the "try...catch". Since you are setting f
inside the "try" if it fails (hence try) on something beside the fnfe
then by the time that DataOutputStream d = new DataOutputStream(f);
is executed, the f variable may not be instantiated. I'm not sure if
this will work, but if you initialize f to null outside the try..catch
and then test for it being != null outside, before you create the d
object, you might be able to get around the error. I don't claim this
will work, nor do I claim it to be the best or prettiest solution.
You might try reading the Sun Java Tutorial, or search this ng for a
link to Roedy's site.