public void loadItems(String filename){
        try {
            BufferedReader br = new BufferedReader(new FileReader(filename));
            String theLine;
            while ((theLine = br.readLine()) != null) {
                String[] parts = theLine.split(",");
                items[size] = new SalesItem(parts[0],parts[1],Double.parseDouble(parts[2]),Integer.parseInt(parts[3]));
                size++;
            }
        }
        catch (IOException e) {
            System.err.println("Error: " + e);
        }
    }