Java -合并两个列表，根据属性的值删除重复项

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class MergeAndRemoveDuplicates {
    public static void main(String[] args) {
        List<Item> list1 = new ArrayList<>();
        list1.add(new Item("A", 1));
        list1.add(new Item("B", 2));
        list1.add(new Item("C", 3));

        List<Item> list2 = new ArrayList<>();
        list2.add(new Item("B", 2));
        list2.add(new Item("D", 4));
        list2.add(new Item("E", 5));

        List<Item> mergedList = mergeAndRemoveDuplicates(list1, list2);
        for (Item item : mergedList) {
            System.out.println(item.getName() + " - " + item.getValue());
        }
    }

    public static List<Item> mergeAndRemoveDuplicates(List<Item> list1, List<Item> list2) {
        List<Item> mergedList = new ArrayList<>(list1);
        Set<Integer> existingValues = new HashSet<>();

        for (Item item : mergedList) {
            existingValues.add(item.getValue());
        }

        for (Item item : list2) {
            if (!existingValues.contains(item.getValue())) {
                mergedList.add(item);
                existingValues.add(item.getValue());
            }
        }

        return mergedList;
    }

    static class Item {
        private String name;
        private int value;

        public Item(String name, int value) {
            this.name = name;
            this.value = value;
        }

        public String getName() {
            return name;
        }

        public int getValue() {
            return value;
        }
    }
}