What are these random 0's, and why is my mean not working?

<pre>scan = new Scanner(System.in);
        try {
            System.out.print("Please enter the filename for the integer values: ");
            File file = new File(scan.nextLine());
            scan = new Scanner(file);
            System.out.println("Integer Array Contents: ");
            String del = "";
            int totalOdd = 0;
            int lastZero = -1;
            int minimum = Integer.MAX_VALUE;
            int maximum = Integer.MIN_VALUE;
            int sum = 0;
            double mean;
            int totalIndex = 0;
            int[] oddNumbers = new int[15];
            int arrayIndex = 0;
            while (scan.hasNextLine()) {
                int num = Integer.parseInt(scan.next()); //parse the number into an integer.
                System.out.print(del + num);
                del = ", ";
                if (num%2!= 0) { //it's odd
                    oddNumbers[arrayIndex] = num; //you have to use the arrayIndex variable here
                    arrayIndex++;
                    totalOdd++; //technically we could combine these vars if we wanted
                }
                if (num == 0) {
                    lastZero= totalIndex;
                }
               
                if (num < minimum) {
                    minimum = num;
                }
               
                if (num > maximum) {
                    maximum = num;
                }
                sum += num;
                totalIndex++;
            }
           
            mean = sum/totalIndex;
            System.out.println();
            System.out.println("Total odd numbers: " + totalOdd);
            System.out.print("Odd numbers are: ");
            for (int i = 0; i < totalIndex; i++) {
                System.out.print(oddNumbers[i] + " ");
            }
           
            System.out.println();
            System.out.println("Index of last zero: " + lastZero);
            System.out.println("Minimum: " + minimum);  
            System.out.println("Maximum: " + maximum);
            System.out.println("Sum: " + sum);
            System.out.println("Element mean is: " + mean);
            scan.close();
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}

Integer Array Contents: 
-3, 2, 0, 0, 1, -5
Total odd numbers: 3
Odd numbers are: -3 1 -5 0 0 0 
Index of last zero: 3
Minimum: -5
Maximum: 2
Sum: -5
Element mean is: 0.0