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

Here a version which uses BigDecimal instead of double:

public static BigDecimal calculateAverage(final List values) {
    int sum = 0;
    if (!values.isEmpty()) {
        for (final Integer v : values) {
            sum += v;
        }
        return new BigDecimal(sum).divide(new BigDecimal(values.size()), 2, RoundingMode.HALF_UP);
    }
    return BigDecimal.ZERO;
}