For a directed graph, returns the node for which edge is an incoming edge. For an undirected graph, throws an UnsupportedOperationException.
(Object edge)
| 338 | * For an undirected graph, throws an {@link UnsupportedOperationException}. |
| 339 | */ |
| 340 | N target(Object edge); |
| 341 | |
| 342 | /** |
| 343 | * Returns the number of edges {@linkplain #incidentEdges(Object) incident} in this graph |