Java8 -如何将嵌套映射转换为通过内部映射键的值收集的嵌套映射列表

import java.util.*;
import java.util.stream.Collectors;

public class Main {
    public static void main(String[] args) {
        Map<String, Map<String, Integer>> nestedMap = new HashMap<>();
        Map<String, Integer> innerMap1 = new HashMap<>();
        innerMap1.put("key1", 1);
        innerMap1.put("key2", 2);
        nestedMap.put("map1", innerMap1);

        Map<String, Integer> innerMap2 = new HashMap<>();
        innerMap2.put("key3", 3);
        innerMap2.put("key4", 4);
        nestedMap.put("map2", innerMap2);

        List<Map<String, Integer>> nestedMapList = nestedMap.values().stream()
                .collect(Collectors.toList());

        System.out.println(nestedMapList);
    }
}