Get last inserted document with tag MongoDB Java -

i working in java using 2.6 java driver.

i using "i" tag identify site.

what best way query in order last inserted document "i" = "99159" ?

please provide example code.

an example document in mongo:

 {    "_id": objectid("560bc0eee4b01a37814ee444"),    "datadate": "2015-09-30t11:00:00z",    "i": "99159",    "lat": "50.61359",    "lon": "-1.95875",    "name": "swanage",    "country": "england",    "continent": "europe",    "elevation": "10.0",    "period": {      "type": "day",      "value": "2015-09-30z",      "rep": {        "h": "75.9",        "t": "14.7",        "dp": "10.5",        "minsincemidnight": "600"     }   } }    

as have _id objectid, can sort data on _id last inserted record.

sample code:

 mongoclient mongoclient = new mongoclient(new serveraddress("localhost", 27017));  mongoclient mongo = new mongoclient("localhost", 27017);  db mongodb = (db) mongo.getdb("testdb");  dbcollection collection = mongodb.getcollection("collection");   basicdbobject findobject = new basicdbobject().append("i","99159");  basicdbobject sortobject = new basicdbobject().append("_id", -1);   dbcursor cur = collection.find(findobject).sort(sortobject).limit(1);  dbobject obj = cur.one();