java实现将list中对象的省市区统计成 List<Map<String,List<Map<String,Object>>>>结构

可以使用Java的流操作和集合操作来实现将List中的对象的省市区统计成List<Map<String, List<Map<String, Object>>>>结构。下面是一个可能的实现示例：

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

public class ListConverter {
    public static List<Map<String, List<Map<String, Object>>>> convertList(List<Address> addresses) {
        // 使用流操作将地址列表按省份进行分组
        Map<String, List<Address>> provinceMap = addresses.stream()
                .collect(Collectors.groupingBy(Address::getProvince));

        // 构建结果列表
        List<Map<String, List<Map<String, Object>>>> resultList = new ArrayList<>();

        // 遍历省份列表
        for (Map.Entry<String, List<Address>> provinceEntry : provinceMap.entrySet()) {
            String province = provinceEntry.getKey();
            List<Address> provinceAddresses = provinceEntry.getValue();

            // 使用流操作将省份下的地址按城市进行分组
            Map<String, List<Address>> cityMap = provinceAddresses.stream()
                    .collect(Collectors.groupingBy(Address::getCity));

            // 构建省份的结果Map
            Map<String, List<Map<String, Object>>> provinceResult = new HashMap<>();
            resultList.add(provinceResult);

            // 遍历城市列表
            for (Map.Entry<String, List<Address>> cityEntry : cityMap.entrySet()) {
                String city = cityEntry.getKey();
                List<Address> cityAddresses = cityEntry.getValue();

                // 构建城市的结果Map
                List<Map<String, Object>> cityResult = new ArrayList<>();
                provinceResult.put(city, cityResult);

                // 遍历区域列表
                for (Address address : cityAddresses) {
                    // 构建区域的结果Map
                    Map<String, Object> districtResult = new HashMap<>();
                    districtResult.put("district", address.getDistrict());
                    cityResult.add(districtResult);
                }
            }
        }
        return resultList;
    }

    public static void main(String[] args) {
        // 测试数据
        List<Address> addresses = new ArrayList<>();
        addresses.add(new Address("江苏省", "南京市", "鼓楼区"));
        addresses.add(new Address("江苏省", "南京市", "玄武区"));
        addresses.add(new Address("江苏省", "苏州市", "姑苏区"));
        addresses.add(new Address("浙江省", "杭州市", "西湖区"));

        List<Map<String, List<Map<String, Object>>>> result = convertList(addresses);
        System.out.println(result);
    }

    // 地址类，包含省份、城市和区域信息
    static class Address {
        private String province;
        private String city;
        private String district;

        public Address(String province, String city, String district) {
            this.province = province;
            this.city = city;
            this.district = district;
        }

        public String getProvince() {
            return province;
        }

        public String getCity() {
            return city;
        }

        public String getDistrict() {
            return district;
        }
    }
}

运行上述示例代码，将会输出统计结果的列表。每个元素都是一个省份的结果Map，其中每个键值对表示一个城市和对应的区域列表。注意，示例代码中使用了静态内部类Address来表示地址信息，你可以根据实际需求替换为自己的对象类型。