Return to site

JAVA CERTIFICATION QUESTION: The Optional class and null values in Java

· java,ocp


Call of the code below cause an exception:

Which approach will fix the problem? Choose one.

A. Wrap Config in ThreadLocal:

ThreadLocal tl = ThreadLocal.withInitial(() -> cfg);

B. Override put(Object, Object) and setProperty(String, String) to avoid storing null values in the Config class.

C. Use Optional.ofNullable(...) instead of Optional.of(...) in Config

D. Use a Supplier as a second parameter for the BiFunction.








·ꓷ uoᴉʇdo sᴉ ɹǝʍsuɐ ʇɔǝɹɹoɔ ǝɥꓕ


All Posts

Almost done…

We just sent you an email. Please click the link in the email to confirm your subscription!