MongoDB Database, equivalent for SELECT column1, column2 FROM tbl

From my MongoDB I want the equivalent for

  SELECT column1, column2
  FROM tbl

With this code I get all the 'rows' but also all the 'columns'

  DBCollection collection = database.getCollection("names");
  DBCursor cursor = collection.find();

I for example would like all the 'rows' but only the 'columns': id, name, age

How would I do this?

Thanks for any help!!