如何仅捕获ArrayList中的重复元素？

import java.util.*;

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

        for (Integer element : list) {
            if (!set.add(element)) {
                duplicates.add(element);
            }
        }

        System.out.println("Duplicates: " + duplicates);
    }
}

import java.util.*;

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

        for (Integer element : list) {
            map.put(element, map.getOrDefault(element, 0) + 1);
        }

        for (Map.Entry<Integer, Integer> entry : map.entrySet()) {
            if (entry.getValue() > 1) {
                duplicates.add(entry.getKey());
            }
        }

        System.out.println("Duplicates: " + duplicates);
    }
}

import java.util.*;
import java.util.stream.Collectors;

public class DuplicateElements {
    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>(Arrays.asList(1, 2, 3, 4, 2, 3, 5));
        List<Integer> duplicates = list.stream()
                .collect(Collectors.groupingBy(e -> e, Collectors.counting()))
                .entrySet().stream()
                .filter(entry -> entry.getValue() > 1)
                .map(Map.Entry::getKey)
                .collect(Collectors.toList());

        System.out.println("Duplicates: " + duplicates);
    }
}