How do I turn a Java Enumeration into a Stream?

Question

I have a third party library that gives me an Enumeration. I want to work with that enumeration lazily as a Java 8 Stream, calling thing

Answer 1

In Java 9 it is possible to convert an Enumeration to a Stream with a one-liner:

Enumeration en = ... ;
Stream str = StreamSupport.stream(
    Spliterators.spliteratorUnknownSize(en.asIterator(), Spliterator.ORDERED),
    false
);

(Well, it's a rather long line.)

If you're not on Java 9, you can convert the Enumeration into an Iterator manually using the technique given in Holger's answer.