Java 22 and Beyond: A Roadmap of Innovations
summary
Java 22 shows concrete changes you can use today: JEP 458 multifile launch lets the Java launcher run a program made of multiple .java files without separate javac steps; unnamed patterns/variables and anonymized matches make exhaustive sealed-class switches far cleaner; constructor statements-before-super let argument validation run before delegating; the gatherers API adds sliding windows and chunking to streams; the foreign function & memory API plus jextract enable native calls (demo: jextract teapot) and reduce JNI pain, while a preview class‑file API promises smoother upgrades across bytecode levels.
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chapters (14)
- 0:00Java 22 innovations
- 1:30Java’s release cadence
- 5:26Project Amber’s start
- 8:57Multi-file launcher
- 13:55Sealed types and records
- 18:14Constructor chaining
- 20:24Pattern matching in switch
- 23:10Unnamed patterns and variables
- 24:57New class file API
- 29:56Gatherers API
- 35:01Foreign function API
- 46:15Project Loom’s threads
- 49:53Scope values in concurrency
- 51:59Further learning
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