Java Optional Complete Guide смотреть онлайн

Java’s Optional class was introduced in 2014 to allow developers to represent the empty state. But what exactly does that mean? And why is it important enough to bother using Optional?

In this video you’ll learn everything you need to know about Optional: how it works, what problems it helps solve, and when not to use it.

▶️ Video chapters (Optional methods in brackets)
Why is Optional confusing? 0:00 (of, empty)
What acutally is Optional? 0:23
What we did before Optional existed 1:53
Using Optional to return an empty value 3:48
How to handle a returned Optional 4:51 (ifPresent, ifPresentOrElse, orElse, orElseThrow)
When should you NOT use Optional? 8:15 (ofNullable, isPresent, get, isEmpty)
6 more advanced Optional patterns 11:20 (orElseGet, or, filter, map, flatMap, stream)

✅ GITHUB REPOSITORY with code examples from the video to try out yourself https://github.com/tkgregory/optional-examples

☕ JDK 18 OPTIONAL API DOCUMENTATION referred to in this video https://docs.oracle.com/en/java/javase/18/docs/api/java.base/java/util/Optional.html

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