How to increment a value in Java Stream?

Question

I want to increment value of index with the each iteration by 1. Easily to be achieved in the for-loop. The variable image

Answer 1

Some kind of "zip" operation would be helpful here, though standard Stream API lacks it. Some third-party libraries extending Stream API provide it, including my free StreamEx library:

IntStreamEx.ints() // get stream of numbers 0, 1, 2, ...
           .boxed() // box them
           .zipWith(StreamEx.ofValues(map)) // zip with map values
           .forKeyValue((index, item) -> image[index].setImage(item.getImage()));

See zipWith documentation for more details. Note that your map should have meaningful order (like LinkedHashMap), otherwise this would be pretty useless...