如何从HashMaps的ArrayList中获取特定值

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

public class HashMapsArrayListExample {
    public static void main(String[] args) {
        // 创建一个包含HashMap对象的ArrayList
        ArrayList<HashMap<String, String>> list = new ArrayList<>();

        // 添加一些HashMap对象到ArrayList中
        HashMap<String, String> map1 = new HashMap<>();
        map1.put("key1", "value1");
        map1.put("key2", "value2");
        list.add(map1);

        HashMap<String, String> map2 = new HashMap<>();
        map2.put("key3", "value3");
        map2.put("key4", "value4");
        list.add(map2);

        // 获取特定值的方法
        String targetValue = getValueFromArrayList(list, "key3");
        System.out.println("特定值为：" + targetValue);
    }

    public static String getValueFromArrayList(ArrayList<HashMap<String, String>> list, String key) {
        for (HashMap<String, String> map : list) {
            if (map.containsKey(key)) {
                return map.get(key);
            }
        }
        return null; // 或者抛出一个异常
    }
}