mongodb java - Removing an elements from basicdblist -

hi have collection contains around 200 documents looks e.g

"_id": 0, "name": "demarcus audette", "scores": [     {         "type": "exam",         "score": 30.61740640636871     },     {         "type": "quiz",         "score": 14.23233821353732     },     {         "type": "homework",         "score": 31.41421298576332     },     {         "type": "homework",         "score": 30.09304792394713     } ] 

now wrote code like

dbcursor cursor = collection.find().sort(new basicdbobject("scores.score":1)); while( cursor.hasnext() ) { dbobject obj=cursor.next(); basicdblist list=(basicdblist) bobj.get("scores"); 

// here getting list of documents consists of scores array , need remove 3rd elements of , save collection.... how do?
if use loop like

for(int i=0;i<list.size();i++) { list.remove(2);------ gives error here  collection.save(obj); } } 

are sure can sort 'scores.score'. 'scores' list of objects cant reference objects inside list using dot notation. error should on line.

edit:

dbcursor cursor = collection.find();     while ( cursor.hasnext()) {         dbobject dbobject = cursor.next();         basicdblist dblist = (basicdblist) (dbobject.get("score"));          //then use java collections.sort() sort list (refer 2 methods @ bottom)         dblist.remove(3);         collection.save(dbobject);     }     

use 1 of following sort dblist
1 . using lambda expression

    collections.sort(dblist, (o1, o2) -> double.compare(((basicdbobject) o1).getdouble("score"), ((basicdbobject) o2).getdouble("score")));     

2. or java 7 <

   collections.sort(dblist, new comparator<object>() {           public int compare(object o, object o2) {         if (((basicdbobject) o).getdouble("score") >= ((basicdbobject) o2).getdouble("score")) {             return 1;         }         return -1;     }     });