在将linkedlist添加到linkedlist时，有没有更好的去重方法？

import java.util.HashSet;
import java.util.LinkedList;

public class LinkedListDuplicateRemoval {
    public static void main(String[] args) {
        LinkedList<Integer> sourceList = new LinkedList<>();
        sourceList.add(1);
        sourceList.add(2);
        sourceList.add(3);
        sourceList.add(2);
        sourceList.add(4);

        LinkedList<Integer> targetList = new LinkedList<>();
        HashSet<Integer> hashSet = new HashSet<>();

        for (Integer num : sourceList) {
            if (!hashSet.contains(num)) {
                targetList.add(num);
                hashSet.add(num);
            }
        }

        System.out.println(targetList);  // 输出：[1, 2, 3, 4]
    }
}