MongoDb's $set equivalent in its java Driver

Question

Is there a way in which I can modify the value of one of the keys in MongoDb via its Java Driver. I tried out the following:

someCollection.update(DBObject query, DBObject update); someCollection.findAndModify(DBObject query, DBObject update); 

But both the functions completely replace the queried document with the updated document. What is the way to update only one of the value of a particular key as in the case of using $set in the mongo shell.(apart from making a completely new Document with all fields copied and one of the fields updated).

Answer 1

BasicDBObject carrier = new BasicDBObject(); BasicDBObject query = new BasicDBObject(); query.put("YOUR_QUERY_STRING", YOUR_QUERY_VALUE);  BasicDBObject set = new BasicDBObject("$set", carrier); carrier.put("a", 6); carrier.put("b", "wx1");         myColl.updateMany(query, set); 

This should work, the answer which is accepted is not right above.