Scanner sc = new Scanner(System.in);

    ArrayList<Double> stock = new ArrayList<Double>();

    String s = sc.nextLine();

    String[] split = s.split("\s+");

    for (int i=0; i<split.length; i++)
    {
        stock.add(Double.parseDouble(split[i]));
    }

Scanner sc = new Scanner(System.in);

    ArrayList<Double> stock = new ArrayList<Double>();

    while (sc.hasNextDouble())
    {
        double d = sc.nextDouble();

        stock.add(d);
    }