Optional Java 11

https://www.baeldung.com/java-optional-uses
As per the Java 11 documentation the purpose of Optional is to provide a return type that can represent the absence of value in scenarios where returning null might cause unexpected errors like the infamous NullPointerException

https://www.baeldung.com/java-optional
In this article we covered most of the important features of Java 8 Optional class We briefly explored some reasons why we would choose to use Optional instead of explicit null checking and input validation

https://blogs.oracle.com/javamagazine/post/12...
Java SE 12 recipes for using the Optional class as it s meant to be used June 22 2020 13 minute read Mohamed Taman Follow these dozen best practices to protect your applications against ugly null pointer exceptions and make your code more readable and concise Download a PDF of this article

https://blogs.oracle.com/javamagazine/post/the...
Optional is an effort to minimize the number of null pointer exceptions in Java by introducing the possibility of creating more flexible APIs that allow a method s return type to indicate no result without using the null reference to indicate the missing value

https://docs.oracle.com/en/java/javase/11/docs/api/...
Returns an Optional describing the given value if non null otherwise returns an empty Optional

https://www.tutorialspoint.com/java/java_optional_class.htm
Optional object is used to represent null with absent value This class has various utility methods to facilitate code to handle values as available or not available instead of checking null values It is introduced in Java 8 and is similar to what Optional is in Guava

https://dev.java/learn/api/streams/optionals
In a nutshell the Optional class is a wrapper class that can wrap a reference Optional or a value OptionalInt OptionalLong and OptionalDouble The difference with the classic wrapper types that you already know Integer Long Double etc is that an optional object can be empty

https://www.hitechpoints.com/java-11-optional-class
Java 11 Optional Class Java 11 introduced new method to Optional class as isEmpty to check if value is present isEmpty returns false if value is present otherwise true It can be used as an alternative of isPresent method which often needs to negate to check if value is not present

https://javadevcentral.com/optional-new-methods
Optional was added to Java 8 This post explains the new methods or APIs added to the Optional class in Java from Java 9 through 11 with examples