Is there a Java equivalent of Python's 'enumerate' function?

Question

In Python, the enumerate function allows you to iterate over a sequence of (index, value) pairs. For example:

>>> numbers = [\"zero\", \"one\", \"tw         


        

Answer 1

For collections that implement the List interface, you can call the listIterator() method to get a ListIterator. The iterator has (amongst others) two methods - nextIndex(), to get the index; and next(), to get the value (like other iterators).

So a Java equivalent of the Python above might be:

List numbers = Arrays.asList("zero", "one", "two");
ListIterator it = numbers.listIterator();
while (it.hasNext()) {
    System.out.println(it.nextIndex() + " " + it.next());
}

which, like the Python, outputs:

0 zero
1 one
2 two