Sealed classes (standard) in Java 17.

Overview

Sealed classes (standard) in Java 17.

Example 

  // Java 17 feature: Sealed classes (standard)
// See official JDK release notes for migration details

Common Use Cases

  • Modern Java 17 development
  • Migration from older JDK versions

Pitfalls to Avoid

  • Assuming feature availability on older JDKs
  • Not checking --release compiler flag
  • Java 16 features
  • JDK release notes

Best Practices

  • Understand when to use sealed classes (standard) versus simpler alternatives
  • Write unit tests covering edge cases and failure paths
  • Follow Java conventions and prefer standard library APIs when available
  • Profile before optimizing — measure impact in your specific workload