例如：

plants 和houses 两个集合，进行对比过滤，取出plants里和houses不同的部分，并返回。

List<ImprovedSeedPlant> plants = improvedSeedPlantMapper.selectList(spWrapper);
List<StudsheepSheepHouse> houses = houseMapper.selectList(houseWrapper);List<ImprovedSeedPlant> dataList = new ArrayList<>();Map<String,StudsheepSheepHouse> resultMap = houses.stream().collect(Collectors.toMap(StudsheepSheepHouse::getHouseNum, Function.identity()));if (!org.springframework.util.StringUtils.isEmpty(plants)){for (ImprovedSeedPlant p : plants) {String key = p.getSheepHouseName();if(!resultMap.containsKey(key)){dataList.add(p);}}}