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. Apr 28, 2025 · What if we want to restrict the number of classes that can inherit from a particular class? The answer is sealed class. So, a sealed class is a technique that limits the number of classes that can inherit the given class. Sealed classes and interfaces restrict which other classes or interfaces may extend or implement them. For background information about sealed classes and interfaces, see JEP 409.
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