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Ans. Please not that all such questions can be easily answered through recursion. Simple recursive implementation could be traverse(root); void traverse(Element element){ if(element.hasNext()){ traverse(element.next()); } else { System.out.println(element); } } but this algo / code lead to endless loop if there is a loop in graph traversal. So you can keep a collection to keep track of which elements have laready been traversed static List<Elements> listOfAlreadyTraversedElements = new ArrayList<Elements>(); main(){ traverse(root); } void traverse(Element element){ if(element.hasNext()){ traverse(element.next()); } else { listOfAlreadyTraversedElements.add(element); System.out.println(element); } }  
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