MultiValuedMap声明的问题

import org.apache.commons.collections4.MultiValuedMap;
import org.apache.commons.collections4.multimap.ArrayListValuedHashMap;

public class Main {
    public static void main(String[] args) {
        // 创建一个 MultiValuedMap 实例
        MultiValuedMap<String, String> map = new ArrayListValuedHashMap<>();

        // 添加键值对
        map.put("key1", "value1");
        map.put("key1", "value2");
        map.put("key2", "value3");

        // 获取键对应的所有值
        List<String> valuesForKey1 = map.get("key1");
        System.out.println("Values for key1: " + valuesForKey1);

        // 遍历所有的键值对
        for (String key : map.keySet()) {
            System.out.println("Key: " + key);
            for (String value : map.get(key)) {
                System.out.println("Value: " + value);
            }
        }
    }
}

<dependency>
    <groupId>org.apache.commons</groupId>
    <artifactId>commons-collections4</artifactId>
    <version>4.4</version>
</dependency>

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Main {
    public static void main(String[] args) {
        // 创建一个 MultiValuedMap 实例
        Map<String, List<String>> map = new HashMap<>();

        // 添加键值对
        map.computeIfAbsent("key1", k -> new ArrayList<>()).add("value1");
        map.computeIfAbsent("key1", k -> new ArrayList<>()).add("value2");
        map.computeIfAbsent("key2", k -> new ArrayList<>()).add("value3");

        // 获取键对应的所有值
        List<String> valuesForKey1 = map.get("key1");
        System.out.println("Values for key1: " + valuesForKey1);

        // 遍历所有的键值工
        for (String key : map.keySet()) {
            System.out.println("Key: " + key);
            for (String value : map.get(key)) {
                System.out.println("Value: " + value);
            }
        }
    }
}