Java 15 and IntelliJ IDEA – IntelliJ IDEA Blog | JetBrains
Java 15 introduces a new language feature – sealed classes and interfaces. The language syntax allows you to restrict the classes or interfaces that can extend or implement other classes or interfaces
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IntelliJ IDEA에서 Java 15 버전의 특징을 정리한 자료를 공유하고 있네요.
