public int outDegreeOf(V vertex) {
Set<E> res = outgoingEdgesOf(vertex);
return res.size();
}
/**
* .
*
* @return
*/
public int edgeCount() {
return vertexEdges.size();
}
public int inDegreeOf(V vertex) {
Set<E> res = incomingEdgesOf(vertex);
return res.size();
}