question: public void makeMapping ( Vector < Vector < MappingObject > > mapVec ) { this . mapping = new MappingObject [ mapVec . size ( ) ] [ ] ; for ( int i = 0 ; i < this . mapping . length ; i ++ ) { Vector < MappingObject > line = mapVec . elementAt ( i ) ; this . mapping [ i ] = new MappingObject [ line . size ( ) ] ; for ( int j = 0 ; j < line . size ( ) ; j ++ ) { this . mapping [ i ] [ j ] = line . elementAt ( j ) ; } } return ; }
target:  Sets the mapping field to an array version of mapVec, which must be a vector  of vectors of MappingObjects.