在Java中排序地图不起作用

import java.util.*;

public class MapSort {
    public static void main(String[] args) {
        Map<String, Integer> map = new HashMap<>();
        map.put("A", 3);
        map.put("B", 1);
        map.put("C", 2);

        List<Map.Entry<String, Integer>> list = new ArrayList<>(map.entrySet());
        list.sort(Map.Entry.comparingByValue());

        for (Map.Entry<String, Integer> entry : list) {
            System.out.println(entry.getKey() + "=" + entry.getValue());
        }
    }
}

import java.util.*;

public class MapSort {
    public static void main(String[] args) {
        Map<String, Integer> map = new TreeMap<>();
        map.put("A", 3);
        map.put("B", 1);
        map.put("C", 2);

        for (Map.Entry<String, Integer> entry : map.entrySet()) {
            System.out.println(entry.getKey() + "=" + entry.getValue());
        }
    }
}