Since I can programme the average price of several income?

Hi,
Could you please clarify what exactly do you need?

That instruction of program is in use for determining the average price of several positions?

Please consider the following code to calculate filled orders average price:

    public void calculateAveragePrice() throws JFException {
       double sumOfPrices = 0;
       int orderCount = 0;
       for (IOrder order: engine.getOrders()) {
          if (order.getState().equals(IOrder.State.FILLED)){
             sumOfPrices += order.getOpenPrice();
             orderCount ++;
          }
       }
       console.getOut().println("Aerage price for " + orderCount + " orders: " + (sumOfPrices/ orderCount));
    }