Convert List of Strings into Map using Java-8 Streams API

Question

I have List

List<String> cars = Arrays.asList("Ford", "Focus", "Toyota", "Yaris","Nissan", "Micra", "Honda", "Civic");

Now, can I convert this List into Map where I get ford = focus, Toyota = yaris, Nisan = Micra, Honda = Civic using Java 8 Streams API?

Answer 1

Here is an example on how you could do it :

 Map<String, String> carsMap =
            IntStream.iterate(0, i -> i + 2).limit(cars.size() / 2)
                    .boxed()
                    .collect(Collectors.toMap(i -> cars.get(i), i -> cars.get(i + 1)));

Basically, just iterates over every 2 elements and maps it with the next one.
Note that if the number of elements is not even, it won't take into consideration the last element.