Java Stream比较两个List的差异并取出不同的对象四种方法

        List<String> list1 = Arrays.asList("A", "B", "C", "D");
        List<String> list2 = Arrays.asList("B", "C", "E", "F", "A", "D");
        List<String> diff = list1.stream().filter(item -> !list2.contains(item)).collect(Collectors.toList());
        List<String> diff1 = list2.stream().filter(item -> !list1.contains(item)).collect(Collectors.toList());
        diff.addAll(diff1);

        diff.forEach(x -> System.out.println(x));

List<String> list1 = Arrays.asList("apple", "banana", "orange", "pear");
List<String> list2 = Arrays.asList("apple", "banana", "grape");

List<String> list3 = Stream.concat(
        list1.stream().filter(str -> !list2.contains(str)),
        list2.stream().filter(str -> !list1.contains(str)))
        .collect(Collectors.toList());

System.out.println("Different strings: " + list3);

List<Object> l1 = new ArrayList<>();
l1.add(new Object(1, "a"));
l1.add(new Object(2, "b"));
l1.add(new Object(3, "c"));

List<Object> l2 = new ArrayList<>();
l2.add(new Object(1, "a"));
l2.add(new Object(3, "c"));
l2.add(new Object(4, "d"));

List<Object> resultList = Stream.concat(l1.stream(), l2.stream())
        .collect(Collectors.groupingBy(Function.identity(), Collectors.counting()))
        .entrySet().stream()
        .filter(e -> e.getValue() == 1)
        .map(Map.Entry::getKey)
        .collect(Collectors.toList());

List<ProductAttributeNameDTO> l1 = Arrays.asList(
        new ProductAttributeNameDTO(1L, "颜色"),
        new ProductAttributeNameDTO(2L, "尺码"),
        new ProductAttributeNameDTO(3L, "重量")
);
List<ProductAttributeNameDTO> l2 = Arrays.asList(
        new ProductAttributeNameDTO(1L, "颜色"),
        new ProductAttributeNameDTO(3L, "重量"),
        new ProductAttributeNameDTO(4L, "材质")
);

List<ProductAttributeNameDTO> resultList = Stream.concat(l1.stream(), l2.stream())
        .collect(Collectors.groupingBy(ProductAttributeNameDTO::getName, Collectors.counting()))
        .entrySet().stream()
        .filter(e -> e.getValue() == 1)
        .map(e -> e.getKey())
        .map(name -> Stream.concat(l1.stream(), l2.stream()).filter(p -> p.getName().equals(name)).findFirst().get())
        .collect(Collectors.toList());

//取出不同的集合
List<ObituaryInfoVO> userList = obituaryInfoVOS.stream()
                    .filter(obituaryInfoVO -> !digitalAssetVOList.stream()
                            .map(digitalAssetVO -> digitalAssetVO.getObituaryId())
                            .collect(Collectors.toList())
                            .contains(obituaryInfoVO.getId()))
                    .collect(Collectors.toList());
//取出相同的集合
List<TeamArea> userList = areaList.stream().collect(Collectors.collectingAndThen(
//                Collectors.toCollection(() -> new TreeSet<>(Comparator.comparing(TeamArea::getSecondRegion))),
//                ArrayList::new));