Why should Java 8's Optional not be used in arguments

Question

I\'ve read on many Web sites Optional should be used as a return type only, and not used in method arguments. I\'m struggling to find a logical reason why. For example I h

Answer 1

Check out the JavaDoc in JDK10, https://docs.oracle.com/javase/10/docs/api/java/util/Optional.html, an API note is added:

API Note: Optional is primarily intended for use as a method return type where there is a clear need to represent "no result," and where using null is likely to cause errors.