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I think we could simply maintain a list of visitedNodes. So during iteration if we find any node thats already part of visited node list then we could say we have loop provided the list does not any duplicates.
If duplicates we need to come up with hashcode for each node and do comparison. Hope that make sense. Anyways following is the java snippet that should tell you loops and the link thats actually causing the loop (for no duplicates scenario)
- reachpraveen11 August 01, 2013