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Binary Tree in Java 8 : Map<Integer, String> myMap = new HashMap<Integer, String>(); List<String> myList = new ArrayList<String>(); Object temp; for (Object obj : objList) { temp = obj; while (temp.getParentId() != defaultId) { myList.add(temp.getName().replaceAll(REGEX, HYPHEN).toLowerCase()); for (Object o : objList) { if (o.getId() == temp.getParentId()) { temp = o; break; } } } myList.add(temp.getName().replaceAll(REGEX, HYPHEN).toLowerCase()); if (myList.size() == 0) { myMap.put(obj.getId(), myList.get(0)); } else { Collections.reverse(myList); String url = myList.stream().collect(Collectors.joining(SLASH)); myMap.put(obj.getId(), url); } myList.clear(); }