void function ( ) { nodes . clear ( ) ; edges . clear ( ) ; }
clears the nodes and edges . concode_field_sep ArrayList<Edge> edges concode_elem_sep ArrayList<Node> nodes concode_elem_sep Graph graph concode_field_sep boolean contains concode_elem_sep boolean contains concode_elem_sep ArrayList<Node> getNodes concode_elem_sep boolean addNode concode_elem_sep void addNodes concode_elem_sep void addEdges concode_elem_sep Graph getGraph concode_elem_sep String toString concode_elem_sep ArrayList<Edge> getEdges concode_elem_sep boolean addEdge