java convert optional to list code example
Example 1: java 8 stream option
things.stream()
.map(this::resolve)
.filter(Optional::isPresent)
.map(Optional::get)
.findFirst();
Example 2: java optional to collection
public static <T> List<T> toList(Optional<T> opt) {
return opt
.map(Collections::singletonList)
.orElseGet(Collections::emptyList);
}