code: public DBObject addObject(String objID, String tableName) {
          DBObject dbObj = new DBObject(objID, tableName);
          m_dbObjList.add(dbObj);
          return dbObj;
      }
docs: Create a new DBObject with the given object ID and table name, add it to this
  DBObjectBatch, and return it.
  
  @param objID     New DBObject's object ID, if any.
  @param tableName New DBObject's table name, if any.
  @return          New DBObject.