是否可以在流上重写代码?

我可以简化此代码还是重写使用Stream?我认为这是可能的,但我不知道如何实现。谢谢大家!

@Override
public List transformList(List list) {
List<QuestionDto> questionDtoList = (List<QuestionDto>) list;
Set<QuestionDto> resultSet = new HashSet<>();
for (QuestionDto question : questionDtoList) {
    Set<TagDto> setTag = new HashSet<>();
    for (QuestionDto question1 : questionDtoList) {
         if (question.getId().equals(question1.getId())) {
             setTag.addAll(question.getTags());
             setTag.addAll(question1.getTags());
         }
    }
    List<TagDto> tagDtoList = new ArrayList<>(setTag);
    question.setTags(tagDtoList);
    resultSet.add(question);
    }
  return new ArrayList<>(resultSet);
}
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