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

I think this should be the java functionality that resemble the python "enumerate" most, though it is quite complicated and inefficent. Basically, just map the list's indices to its elements, using ListIterator or Collector:

List list = new LinkedList<>(Arrays.asList("one", "two", "three", "four"));
Map enumeration = new Map<>();
ListIterator iter = list.listIterator();
while(iter.hasNext){
    map.put(iter.nextIndex(), iter.next());
}

or using lambda expression:

Set enumeration = IntStream.range(0, list.size()).boxed.collect(Collectors.toMap(index -> index, index -> list.get(index)));

then you can use it with an enhanced for loop:

for (Map.Entry entry : enumeration.entrySet){
    System.out.println(entry.getKey() + "\t" + entry.getValue());
}