public QuadEdge makeEdge(Vertex o,Vertex d){
  QuadEdge q=QuadEdge.makeEdge(o,d);
  quadEdges.add(q);
  return q;
}

public QuadEdge makeEdge ( Vertex o , Vertex d ) { QuadEdge q = QuadEdge . makeEdge ( o , d ) ; quadEdges . add ( q ) ; return q ; }
creates a new quadedge , recording it in the edges list .
