Java Optional Tutorial - How to Use Optional Class In Java
Java Optional is a container object which may or may not contain a non-null value. If a value is present, isPresent() will return true and get() will return the value. - Java Docs
The Java Optional class was introduced in Java 8 but has been improved ever since with new methods. We can use it to prevent null pointer exceptions (nullpointerexceptions).
An Optional can either be in two states, have a value present or empty state.
You can use Java Optionals to avoid null checks, we can check is an Optional has a value by calling isPresent method.
To assign a value to an Optional we can use the of or ofNullable method.
of: Returns an Optional with the specified present non-null value. - (Java Docs)
ofNullable: Returns an Optional describing the specified value, if non-null, otherwise returns an empty Optional. - (Java Docs)
TimeStamps 🕰 :
00:00 The Need For Optionals
03:36 Creating New Optional
07:28 Optional isPresent and isEmpty
12:15 Optional orElse
16:52 Optional Map
20:10 Optional Filter
23:20 Optional ifPresent
25:51 Optional of NonNull Return
31:30 Optional of Nullable Return
Support Lemubit Academy on Patreon and get lovely benefits as an appreciation 😃: / lemubitacademy
If you enjoyed this video, consider 🔴subscribing to be a part of the Lemubit Academy Network: https://bit.ly/2O2x0H1
Connect With Lemubit Academy And Lemuel Ogbunude 🔍:
🌐Website: https://www.lemubitacademy.com/
🏢Linkedin: / lemuelcco
📸Instagram: / lemubitacademy
On this page of the site you can watch the video online Java Optional Tutorial - How to Use Optional Class In Java with a duration of hours minute second in good quality, which was uploaded by the user Lemubit Academy 30 June 2020, share the link with friends and acquaintances, this video has already been watched 6,514 times on youtube and it was liked by 96 viewers. Enjoy your viewing!
