java 遍历两个List按名称关联匹配合并

/**
 *  通过遍历两个List中按名称关联匹配
 * @param oneList
 * @param twoList
 * @param govLevel
 */
public static List<实体> compareListHitData(List<实体> oneList, List<实体> twoList, int govLevel) {
    switch (govLevel) {
        case 2:
            List<实体> cityList = oneList.stream().map(user -> twoList.stream()
                    .filter(city -> Objects.equals(one字段, two字段))
                    .findFirst().map(i -> {
                        user.setCityCode((String) i.get("value"));// 需合并字段
                        return user;
                    }).orElse(null))
                    .filter(Objects::nonNull).collect(Collectors.toList());
            return cityList;
        case 3:
            List countyList = oneList.stream().map(user -> twoList.stream()
                    .filter(county -> Objects.equals(one字段, two字段) &&
                            Objects.equals(one字段, two字段)
                    )
                    .findFirst().map(i -> {
                        user.setCountyCode((String) i.get("value"));// 需合并字段
                        return user;
                    }).orElse(null))
                    .filter(Objects::nonNull).collect(Collectors.toList());
            return countyList;
        case 4:
            List townsList = oneList.stream().map(user -> twoList.stream()
                    .filter(town -> Objects.equals(one字段, two字段) && Objects.equals(one字段, two字段)
                    )
                    .findFirst().map(i -> {
                        user.setTownsCode((String) i.get("value"));// 需合并字段
                        return user;
                    }).orElse(null))
                    .filter(Objects::nonNull).collect(Collectors.toList());
            return townsList;
        default:
            return oneList;
    }
}