Question

I love to use a for loop with the iterator principle, like

for(String s : collectionWithStrings)
    System.out.println(s + ", ");

Question: How can I determine if the current element is the last one?

With an own index like int = 0; i < collection.size(); i++ this is possible with i == collection.size() - 1, but not nice. Is it also possible to determine the last element with an iterator for the example above?

Answer 1

Indeed, the Iterator#hasNext method returns a boolean determining if the iterator will return another element with the next method.

Your iteration can be put as this:

Iterator<String> iterator = collectionWithString.iterator();
while(iterator.hasNext()) {
    String current = iterator.next();
    // if you invoke iterator.hasNext() again you can know if there is a next element
}