edge
to the graph. Graph does not accept parallel edges. Fails if edge
is already in the graph.
@param edge the edge to add
@return true if add is successful, false otherwise
@throws IllegalArgumentException if edge
is null
,or if nodes are not legal nodes for this edge
, or if edge
is directed when the graph is undirected, or if edge
is undirected when the graph is directed,
@throws IllegalMonitorStateException if the current thread is holding a read lock
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