Question

Possible Duplicate:
Why do I get the “Unhandled exception type IOException”?

I’m trying to solve Euler #8 using the following algorithm. Problem is, whenver I modify the line I have the giant comment on, the error Unhandled Exception Type IOException appears on each line that I’ve marked with the comment //###.

private static void euler8()
{   
    int c =0;
    int b;
    ArrayList<Integer> bar = new ArrayList<Integer>(0);
    File infile = new File("euler8.txt");
    BufferedReader reader = new BufferedReader(
                            new InputStreamReader(
                            new FileInputStream(infile), //###
                            Charset.forName("UTF-8")));
        while((c = reader.read()) != -1) { //###
          char character = (char) c;
          b = (int)character;
          bar.add(b); /*When I add this line*/
        }
    reader.close(); //###
}

Answer 1

Yes, IOException is a checked exception, which means you either need to catch it, or declare that your method will throw it too. What do you want to happen if the exception is thrown?

Note that you should generally be closing the reader in a finally block anyway, so that it gets closed even in the face of another exception.

See the Java Tutorial lesson on exceptions for more details about checked and unchecked exceptions.