Get value from one Optional or another

by

Java 9 and above:

firstOptional.or(() -> secondOptional);

Java 8 and below

If you want to avoid mentioning firstOptional twice, you’d probably have to go with something like

firstOptional.map(Optional::of).orElse(secondOptional);

or

Optional.ofNullable(firstOptional.orElse(secondOptional.orElse(null)));

But the most readable variant is probably to simply do

Optional<...> opt = firstOptional.isPresent()  ? firstOptional
                  : secondOptional.isPresent() ? secondOptional
                  : Optional.empty();

If someone stumbles across this question but has a list of optionals, I’d suggest something like

Optional<...> opt = optionals.stream()
                             .filter(Optional::isPresent)
                             .findFirst()
                             .orElse(Optional.empty());

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