Immutable Collections in Java with Sealed Types

Thu, 10 Dec 2020 03:02:00 +0000

Designing Immutable Collection using Sealed Types in JDK 15

How to define contractual, structural, and verifiable immutable Java collections.

Introducing Sealed Types

JDK 15 was released on September 15, 2020. JEP 360 Sealed Types was included as a preview feature in this release, with its second preview in JDK 16. Sealed Types is part of Project Amber. Sealed classes or interfaces can be used to restrict the interfaces or classes that are allowed to extend them. This is accomplished by using the sealed, non-sealed, and permits modifiers.

Don Raab on foojay.io - Friends Of OpenJDK

Immutable Collections in Java with Sealed Types

Introducing Sealed Types