question: NetClass append ( String p_name , board . BrdLayerStructure p_layer_structure , ClearanceMatrix p_clearance_matrix ) { NetClass new_class = new NetClass ( p_name , p_layer_structure , p_clearance_matrix ) ; class_list . add ( new_class ) ; return new_class ; }
target:  Appends a new empty class with name p_name to the class array