node1
and node2
to the graph. Graph does not accept parallel edges. Fails if a such edge already exists in the graph.
@param node1 the first node
@param node2 the second node
@return true if add is successful, false otherwise
@throws IllegalArgumentException if source
or target
is null
or not legal nodes for this edge
@throws IllegalMonitorStateException if the current thread is holding a read lock
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