Get size of an Iterable in Java

Question

I need to figure out the number of elements in an Iterable in Java. I know I can do this:

Iterable values = ...
it = values.iterator();
while (it.hasNext()) {
  it.next();
  sum++;
}

I could also do something like this, because I do not need the objects in the Iterable any further:

it = values.iterator();
while (it.hasNext()) {
  it.remove();
  sum++;
}

A small scale benchmark did not show much performance difference, any comments or other ideas for this problem?

user_4984125 · Answer

java 8 and above

StreamSupport.stream(data.spliterator(), false).count();