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The major features that are likely to be of interest to developers who upgrade are:
―Switch Expressions
―Enhanced instanceof
―Text Blocks
―Records
―Sealed Types
―JFR Streaming
―Enhanced Modern Cryptography
―Class Data Sharing
―Shenandoah and ZGC Garbage Collectors
―many performance and other internal improvements.
This means that while Java 17 may be a "glass half full" release,
it does represent another major milestone in the evolution of the language.