Question

I have written this code to find out an output and i am running this using Runtime in a servlet. It shows java.util.NoSuchElementEception even though i have checked that input file has some data:

public class Sec1q10 {

static int fact(int n) {
    int p = 1;
    if (n != 1) {
        p = n * fact(n - 1);
    }
    return p;
}

public static void main(String args[]) {
    try {
        System.out.println("first");
        Scanner in = new Scanner(new FileReader("F:/sem5/algorithm/in.txt"));
        String no = in.next();
        int n = Integer.parseInt(no);
        System.out.println(n);
        int s = 0;
        while (n != 0) {
            s += fact(n);
            n--;
        }
        System.out.println("sum=" + s);
        String s1 = "" + s + "here";

        PrintWriter out;
        System.out.println(s1);
        out = new PrintWriter("F:/sem5/algorithm/out.txt");

        out.write(s1);
        System.out.println(s1);

    } catch (Exception ex) {
        System.out.println("Exception: " + ex);
    }

}
}

I even run this on cmd where it is showing the output without any exception but not writing anything in the file F:/sem5/algorithm/out.txt

Answer 1

To see results in output file close PrintWriter after writing in it

    PrintWriter out;
    System.out.println(s1);
    out = new PrintWriter("F:/sem5/algorithm/out.txt");
    try
    {
       out.write(s1);
       System.out.println(s1);
    }
    finally
    {
       out.close();
    }