如何将hashmap的arraylist映射到另一个hashmap arraylist

import java.util.ArrayList;
import java.util.HashMap;

public class HashMapArrayListMapping {
    public static ArrayList<HashMap<String, String>> mapArrayList(ArrayList<HashMap<String, String>> originalList) {
        ArrayList<HashMap<String, String>> mappedList = new ArrayList<>();

        for (HashMap<String, String> map : originalList) {
            HashMap<String, String> newMap = new HashMap<>();

            for (String key : map.keySet()) {
                String value = map.get(key);

                // 检查新的HashMap的ArrayList中是否已存在相同的键
                boolean keyExists = false;
                for (HashMap<String, String> existingMap : mappedList) {
                    if (existingMap.containsKey(key)) {
                        existingMap.put(key, existingMap.get(key) + ", " + value);
                        keyExists = true;
                        break;
                    }
                }

                // 如果不存在相同的键，则创建新的键值对
                if (!keyExists) {
                    newMap.put(key, value);
                }
            }

            mappedList.add(newMap);
        }

        return mappedList;
    }

    public static void main(String[] args) {
        // 示例用法
        ArrayList<HashMap<String, String>> originalList = new ArrayList<>();
        HashMap<String, String> map1 = new HashMap<>();
        map1.put("key1", "value1");
        map1.put("key2", "value2");
        originalList.add(map1);

        HashMap<String, String> map2 = new HashMap<>();
        map2.put("key2", "value3");
        map2.put("key3", "value4");
        originalList.add(map2);

        ArrayList<HashMap<String, String>> mappedList = mapArrayList(originalList);

        // 输出映射结果
        for (HashMap<String, String> map : mappedList) {
            for (String key : map.keySet()) {
                System.out.println(key + ": " + map.get(key));
            }
        }
    }
}