比较2个ArrayLists并返回公共元素

import java.util.ArrayList;

public class ArrayListComparator {
    public static ArrayList<Integer> findCommonElements(ArrayList<Integer> list1, ArrayList<Integer> list2) {
        ArrayList<Integer> commonElements = new ArrayList<>();

        for (Integer element : list1) {
            if (list2.contains(element)) {
                commonElements.add(element);
            }
        }

        return commonElements;
    }

    public static void main(String[] args) {
        ArrayList<Integer> list1 = new ArrayList<>();
        list1.add(1);
        list1.add(2);
        list1.add(3);

        ArrayList<Integer> list2 = new ArrayList<>();
        list2.add(2);
        list2.add(3);
        list2.add(4);

        ArrayList<Integer> commonElements = findCommonElements(list1, list2);

        System.out.println("Common Elements: " + commonElements);
    }
}

Common Elements: [2, 3]