How to retrieve the values from a LinkedList

Question

Hello,
I have just put this question in java programming forums by mistake...I think that it should be here ...
I have created a LinkedList to store the results of a query to a database.
These reasults are decimal numbers and then I want to sum all these numbers to be able to make the average.
But when I try to retrieve the values of the Linked List I always receive an incopatible types error..
Here is an extract of my code in a jsp page.
LinkedList Average = new LinkedList();
String Media = rst.getString(10);
Average.add(Media);
int Size = Average.size();
double Sum = 0.0;
for (int i=0; i<=Size; i++)
                double Result = Average.get(i)     
              Sum = Sum + Result;
}If I try to retrieve the value of only one node from the list , I can just putting <%=Average.get(i)%>...but..how can I retrieve all the values (they are decimal numbers) to be able to add them?

Answer 1

If you want to sum all the values, is there any reason you just don't retrieve the sum from the database rather than the list of values?
anyway
List average = new LinkedList();
while (rst.next()){
  // retrieve the number:
  String mediaString = rst.getString(10);
  Double media = Double.valueOf(mediaString);
  // or maybe like this if it is a number in the database
  Double media = new Double(rst.getDouble(10));
  average.add(media);
doubleSum = 0.0;
for (Iterator it = average.iterator(); it.hasNext(); ){
  Double result= (Double) it.next();
  doubleSum += result.doubleValue();
}