public class Foo {
    private Scanner scanner = new Scanner(System.in);
    private List<Integer> numbers = new ArrayList<>();

    public void Run() {
        promptNumbers();
        if(this.number.size() == 0) {
            System.out.println("No numbers entered.");
        }

        int positives = getPositiveNumbersCount();
        int negatives = getNegativeNumbersCount();
       int average = getAverage();
    }

    private void promptNumbers(){
        System.out.print("Enter an integer, the input ends if it is 0: ");

        int number;
        do {
            number = this.scanner.nextInt());
            if(number != 0) numbers.add(number);
        }while(number != 0);
    }

    private int getPositiveNumbersCount(){
        int counter = 0;
        for(int number : numbers) {
            if(number > 0) {
                counter++;
            }
        }
        return counter;
    }
    private int getNegativeNumbersCount(){
                int counter = 0;
        for(int number : numbers) {
            if(number < 0) {
                counter++;
            }
        }
        return counter;
    }

    private double getAverage() {
        int sum = 0;
        for(int number : numbers) {
            sum += number;
        }
        return sum.doubleValue() / this.number.size();
    }
}