如何比较2个Lists<String>并以列表的形式返回差值？

import java.util.ArrayList;
import java.util.List;

public class ListComparison {
    public static List<String> compareLists(List<String> list1, List<String> list2) {
        List<String> diffList = new ArrayList<>();

        for (String element : list1) {
            if (!list2.contains(element)) {
                diffList.add(element);
            }
        }

        return diffList;
    }

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

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

        List<String> diff = compareLists(list1, list2);
        System.out.println("差值列表: " + diff);
    }
}