Increment counter in lambda functions

------------------ Pre Java 8 ---------------------
Map<Employee, File> fileMap = new HashMap<Employee, File>();
int i =0;
for (Map.Entry<Employee, File> entry : map.entrySet()) {
       i++;
       // do something with i
   }

------------------ Java 8 Lambda ---------------------
AtomicInteger counter = new AtomicInteger(0);
fileMap.forEach((k, v) -> {
	counter.addAndGet(1);
	//do something with i
  });

You can use also

counter.getAndIncrement(); instead of counter.addAndGet(1);