Java 有没有办法从ArrayList中的mongodb访问JSON文档的值？

我有一个代码片段，看起来像这样

MongoDatabase db = DbConnection.getDbConnection(); // connection is successfully made
MongoCollection collection = db.getCollection("candidates"); collection called candidates in the database

ArrayList<String> newList = new ArrayList<>();

FindIterable<Document> findIterable =  collection.find()
    .projection(fields(include("CandidateId"), excludeId()));

for(Document document:findIterable) {
  newList.add(String.valueOf(document));            
  }
System.out.println(newList);

[Document{{CandidateId=1}}, Document{{CandidateId=2}}]

有没有办法得到这样的arrayList，我只需要CandidateId字段的值

[1,2]

您可以这样使用：

newList.add(document.getString("CandidateId"));