如何获取子集合表单集合Java(集合,数组,列表)并跟踪返回的最后一个

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Set<Integer> set = new HashSet<>(Arrays.asList(1, 2, 3, 4, 5));
        Set<Integer> subSet = new HashSet<>(Arrays.asList(2, 3, 4));

        set.retainAll(subSet);

        Integer lastElement = null;
        for (Integer element : set) {
            lastElement = element;
        }

        System.out.println("子集合中的最后一个元素：" + lastElement);
    }
}

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Integer[] array = {1, 2, 3, 4, 5};
        Integer[] subArray = {2, 3, 4};

        List<Integer> arrayList = new ArrayList<>(Arrays.asList(array));
        List<Integer> subArrayList = new ArrayList<>(Arrays.asList(subArray));

        arrayList.retainAll(subArrayList);

        Integer lastElement = null;
        for (Integer element : arrayList) {
            lastElement = element;
        }

        System.out.println("数组中的最后一个元素：" + lastElement);
    }
}

import java.util.*;

public class Main {
    public static void main(String[] args) {
        List<Integer> list = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 5));
        List<Integer> subList = new ArrayList<>(Arrays.asList(2, 3, 4));

        list.retainAll(subList);

        Integer lastElement = null;
        for (Integer element : list) {
            lastElement = element;
        }

        System.out.println("列表中的最后一个元素：" + lastElement);
    }
}