How to get the current loop index when using Iterator?
I had the same question and found using a ListIterator worked. Similar to the test above:
List<String> list = Arrays.asList("zero", "one", "two");ListIterator<String> iter = list.listIterator(); while (iter.hasNext()) { System.out.println("index: " + iter.nextIndex() + " value: " + iter.next());}Make sure you call the nextIndex() before you actually get the next().
Here's a way to do it using your own variable and keeping it concise:
List<String> list = Arrays.asList("zero", "one", "two");int i = 0;for (Iterator<String> it = list.iterator(); it.hasNext(); i++) { String s = it.next(); System.out.println(i + ": " + s);}Output (you guessed it):
0: zero1: one2: twoThe advantage is that you don't increment your index within the loop (although you need to be careful to only call Iterator#next once per loop - just do it at the top).