日期为星期几keySet的LinkedHashMap的平均值

import java.util.LinkedHashMap;
import java.util.Set;

public class LinkedHashMapAverage {
    public static void main(String[] args) {
        LinkedHashMap<String, Integer> map = new LinkedHashMap<>();
        map.put("星期一", 10);
        map.put("星期二", 20);
        map.put("星期三", 30);
        map.put("星期四", 40);
        map.put("星期五", 50);

        Set<String> keySet = map.keySet();
        int sum = 0;
        for (String key : keySet) {
            sum += map.get(key);
        }

        double average = (double) sum / keySet.size();
        System.out.println("日期为星期几keySet的LinkedHashMap的平均值为：" + average);
    }
}