在Java中计算HashMap中List<Double>的平均值

import java.util.HashMap;
import java.util.List;

public class AverageCalculator {
    public static double calculateAverage(HashMap<String, List<Double>> hashMap) {
        double sum = 0;
        int count = 0;

        for (List<Double> valueList : hashMap.values()) {
            for (Double value : valueList) {
                sum += value;
                count++;
            }
        }

        if (count == 0) {
            return 0; // 避免除以0的情况
        }

        return sum / count;
    }

    public static void main(String[] args) {
        HashMap<String, List<Double>> hashMap = new HashMap<>();
        // 假设HashMap中有键值对，键为String类型，值为List<Double>类型

        double average = calculateAverage(hashMap);
        System.out.println("HashMap中List<Double>的平均值为：" + average);
    }
}