Write a program that reads an unspecified number of integers, determines pos, neg, total, average

You need to read more numbers. You read one value before your loop. You could do something like

int number;
while((number = input.nextInt()) != 0) {
    total += number;
    count++;
    if(number > 0){
        positive++;
    } else if(number < 0) {
        negative++;
    }
} // <-- end loop body.
float average = total / (float) count; // <-- not integer math.
System.out.println("The number of positives is " + positive);
System.out.println("The number of negatives is " + negative);
System.out.println("The total is " + total);
System.out.println("The average is " + average);