What are the consequences of returning null from an Optional object and then calling the get method?

If you return null from Optional (for example, Optional.of(null)), it will lead to a NullPointerException when creating the Optional, since of does not allow null.

If the Optional is empty (Optional.empty()) and then you call the get() method, a NoSuchElementException will be thrown because there is no value.

Therefore:

• Never pass null to Optional.of().
• Before calling get(), check for the presence of a value using isPresent() or use methods that handle the absence of a value (orElse, orElseGet).

Example:

Optional<String> opt = Optional.ofNullable(null); // creates an empty Optional
opt.get(); // will throw NoSuchElementException