Is there a concise way to iterate over a stream with indices in Java 8?

Question

Is there a concise way to iterate over a stream whilst having access to the index in the stream?

String[] names = {\"Sam\",\"Pamela\", \"Dave\", \"Pascal\",          


        

Answer 1

One possible way is to index each element on the flow:

AtomicInteger index = new AtomicInteger();
Stream.of(names)
  .map(e->new Object() { String n=e; public i=index.getAndIncrement(); })
  .filter(o->o.n.length()<=o.i) // or do whatever you want with pairs...
  .forEach(o->System.out.println("idx:"+o.i+" nam:"+o.n));

Using an anonymous class along a stream is not well-used while being very useful.