Web Reference: Dec 11, 2025 · In this article, we explored sealed classes and interfaces, a new feature in Java SE 17. We covered the creation and usage of sealed classes and interfaces, as well as their constraints and compatibility with other language features. Like sealed classes, to seal an interface, add the sealed modifier to its declaration. Then, after any extends clause, add the permits clause, which specifies the classes that can implement the sealed interface and the interfaces that can extend the sealed interface. Sep 17, 2021 · A class/interface is sealed by applying the sealed modifier to its declaration. Then, after any extends and implements clauses, the permits clause specifies the classes that are permitted to extend the sealed class.
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