Answer / Poonam Kushwaha

To add a new field to an existing document in MongoDB using Java, you can use the updateOne() method of MongoCollection. Here's an example:

```java
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

public class AddFieldExample {
public static void main(String[] args) {
MongoClient mongoClient = new MongoClient("localhost", 27017);
MongoDatabase database = mongoClient.getDatabase("mydb");
MongoCollection<Document> collection = database.getCollection("mycollection");

// Update an existing document by adding a field
Document filter = new Document("_id", new ObjectId("507f1f77810c19762dfa6cea"));
Document update = new Document("$set", new Document("newField", "newValue"));
collection.updateOne(filter, update);
}
}

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