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

Connect With Lemubit Academy And Lemuel Ogbunude 🔍:

[desabisc]

Very detailed, I finally understand the purpose of Optional. Tank you.

[jvsnyc]

Liked and subscribed. You say right up front that Optional was only half-baked in Java 8 and that there are a bunch of new methods available for dealing with them, so too bad for anyone stuck at work (or somewhere else) on Java 8. Nice stuff, and it made me look around at your other videos and decide to subscribe.

[annabelleellis]

If you are using Java 8, you may use the following. I don't think List.of() is in java 8.

List<Person> personArrayList = Arrays.asList(
new Person("name", 21),
new Person("name", 2),
new Person("namel", 12)
);

[dzmitrysemak]

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