node1
) node to the second (node2
) node. Multiple edges between the same nodes are allowed, and are considered different edges. Self-loops are also allowed.
@param node1 The first node.
@param node2 The second node.
@param weight The weight.
@return The edge.
@exception GraphElementException If the first node or secondnode is not already in the graph.
@exception NullPointerException If the weight is null
.
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