Calculating average of an array list?

Question

I\'m trying to use the below code to calculate the average of a set of values that a user enters and display it in a jTextArea but it does not work properly. Sa

Answer 1

Why use a clumsy for loop with an index when you have the enhanced for loop?

private double calculateAverage(List  marks) {
  Integer sum = 0;
  if(!marks.isEmpty()) {
    for (Integer mark : marks) {
        sum += mark;
    }
    return sum.doubleValue() / marks.size();
  }
  return sum;
}