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. Sep 17, 2021 · Sealed classes are a new feature in Java that provide more control over class hierarchies and help enforce stronger encapsulation. By declaring a class as sealed, developers can specify which classes are allowed to extend it. 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.
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Sealed Keyword Java 17 Java Net Worth 2026: Salary, Income & Wealth Net Worth & Biography
Estimated Worth: $77M - $88M
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Last Updated: April 8, 2026
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