period.java

public int getDegreeDays() {
        ArrayList<Measurement> measurements = getMeasurements();
        int amount = 0;
        int previousDay = 0;
        for (Measurement item : measurements) {
            double averageInside = 0;
            double averageOutside = 0;
            int day =item.getDateStamp().getDayOfYear();
            if (day != previousDay) {
                int averageAmount = 0;
                for (Measurement average : measurements) {
                    if (average.getDateStamp().getDayOfYear() == day) {
                        averageInside += average.getInsideTemp();
                        averageOutside += average.getOutsideTemp();
                        averageAmount++;
                    }
                }
                averageInside = averageInside / averageAmount;
                averageOutside = averageOutside / averageAmount;
                if (averageInside - averageOutside >= 1) {
                    amount += (int) averageInside - averageOutside;
                }
            }
            previousDay = day;
        }
        return amount;
    }