Read from file program.

I need to make a program that reads from a file, to add up 20 scores, from said file and find the mean. Right now I have it reading the values and printing them out, but not adding them up. How would I make it add up all values of "value"

Code:

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public static void main(String[] args) throws IOException, FileNotFoundException {
        processFile("c:\\scores.txt");
    }
public static void processFile (String filename) throws IOException, FileNotFoundException {
    String line;double value;
    BufferedReader inputReader = new BufferedReader (new InputStreamReader(new FileInputStream(filename)));
          while (( line = inputReader.readLine()) != null){
          value= Double.parseDouble(line);
          System.out.println(value);
          value=value+value;
          }
    inputReader.close();
          }
}

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I actually dont have it printing value in the code I posted.

So, rather than replacing the contents of the value variable every time, why not just add to it? Initialize it to 0, then use += on each loop instead of =