编写一个应用程序，在主类Test1类中，创建两个链表List<E>对象，分别存储通过键盘输入的字符串内容

import java.util.*;
public class Test1 {
    public static void main(String args[]) {
        getList();
    }
    private static void getList() {
        LinkedList<String> List1 = new LinkedList<String>();
        LinkedList<String> List2 = new LinkedList<String>();
        List<String> unionList = new ArrayList<String>();
        try {
            Scanner reader = new Scanner(System.in);
            System.out.println("please input list1: ");
            String a = reader.nextLine();
            String b = reader.nextLine();
            String c = reader.nextLine();
            String d = reader.nextLine();
            List1.add(a);
            List1.add(b);
            List1.add(c);
            List1.add(d);
            System.out.println("please input list2: ");
            String q = reader.nextLine();
            String w = reader.nextLine();
            String e = reader.nextLine();
            List2.add(q);
            List2.add(w);
            List2.add(e);
            // 获取去重并集
            unionList = receiveUnionList(List1, List2);
            Iterator<String> unionIterator = unionList.iterator();
            System.out.println("Union: ");
            while (unionIterator.hasNext()) {
                System.out.println(unionIterator.next());
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    public static List<String> receiveUnionList(List<String> List1, List<String> List2) {
        List<String> resultList = new ArrayList<String>();
        Set<String> firstSet = new TreeSet<String>(List1);
        for (String id : List2) {
            firstSet.add(id);
        }
        resultList = new ArrayList<String>(firstSet);
        return resultList;
    }
}