如何安装/使用apache commons集合4.4

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

import org.apache.commons.collections4.ListUtils;
import org.apache.commons.collections4.MapUtils;

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

public class CommonsCollectionsExample {
    public static void main(String[] args) {
        // 使用 ListUtils
        List<String> list1 = new ArrayList<>();
        list1.add("apple");
        list1.add("banana");

        List<String> list2 = new ArrayList<>();
        list2.add("banana");
        list2.add("cherry");

        List<String> combinedList = ListUtils.union(list1, list2);
        System.out.println("Combined List: " + combinedList);

        // 使用 MapUtils
        Map<String, Integer> map1 = new HashMap<>();
        map1.put("apple", 1);
        map1.put("banana", 2);

        Map<String, Integer> map2 = new HashMap<>();
        map2.put("banana", 3);
        map2.put("cherry", 4);

        Map<String, Integer> combinedMap = MapUtils.union(map1, map2);
        System.out.println("Combined Map: " + combinedMap);
    }
}