How to convert an Optional<T> into a Stream<T>?

If restricted with Java-8, you can do this:

Stream<String> texts = optional.map(Stream::of).orElseGet(Stream::empty);

In Java-9 the missing stream() method is added, so this code works:

Stream<String> texts = optional.stream();

See JDK-8050820. Download Java-9 here.

You can do:

Stream<String> texts = optional.isPresent() ? Stream.of(optional.get()) : Stream.empty();