JDK 15 Hidden Classes (JEP 371) for the JVM
Unlike sealed classes, hidden classes (JEP 371) are a JVM rather than a language-level feature, aiming not to change the Java language.
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JDK 15 Sealed Classes: Fine-Grained Mechanism for Inheritance
The most significant new feature in JDK 15, and the only change to the language, is the introduction of sealed classes as a preview feature.
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