Most efficient way to get the last element of a stream

Question

Stream doesn't have a last() method:

Stream<T> stream;
T last = stream.last(); // No such method

What's the most elegant and/or efficient way to get the last element (or null for an empty Stream)?

Answer 1

Do a reduction that simply returns the current value:

Stream<T> stream;
T last = stream.reduce((a, b) -> b).orElse(null);