如何在Java中设置初始移动平均值？

public class MovingAverage {
    private double average;
    private List<Double> data;

    public MovingAverage() {
        average = 0.0;
        data = new ArrayList<>();
    }

    public void addData(double value) {
        data.add(value);
        average = (average * (data.size() - 1) + value) / data.size();
    }

    public double getAverage() {
        return average;
    }

    public static void main(String[] args) {
        MovingAverage ma = new MovingAverage();
        ma.addData(10.0);
        ma.addData(15.0);
        ma.addData(20.0);
        System.out.println("移动平均值: " + ma.getAverage());
    }
}