Java 17 Sealed Classes JEP: 409
Java 17 Sealed Classes JEP: 409
Sealed classes and interfaces restrict which other classes or interfaces may extend or implement them
-The sealed feature introduces a couple of new modifiers and clauses in Java: sealed, non-sealed, permits
Goals
Allow the author of a class or interface to control which code is responsible for implementing it.
Provide a more declarative way than access modifiers to restrict the use of a superclass.
Support future directions in pattern matching by providing a foundation for the exhaustive analysis of patterns.
A sealed class imposes three constraints on its permitted subclasses:
The sealed class and its permitted subclasses must belong to the same module, and, if declared in an unnamed module, to the same package.
Every permitted subclass must directly extend the sealed class.
Every permitted subclass must define a modifier: final, sealed, or non-sealed.
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