modern java

records, sealed types, pattern matching. java from 8 to 27 and how it writes now.

1. 01java 8 → 27every release, what it shipped, and the six-month train.
2. 02preview and incubator features--enable-preview, and how features graduate.
3. 03recordsjava 16+data carriers in one line. what the compiler generates for you.
4. 04sealed typesjava 17+closed hierarchies the compiler can check exhaustively.
5. 05pattern matchingjava 21+instanceof patterns, switch patterns, guards and dominance.
6. 06record patternsjava 21+destructure records, nested, right in the pattern. plus _.
7. 07data-oriented programmingrecords + sealed + patterns = algebraic data types in java.
8. 08simpler programsjava 25+compact source files, instance main, and import module.
9. 09flexible constructor bodiesjava 25+statements before super(), finally.
10. 10what's in preview right nowpreviewprimitive patterns, lazy constants, structured concurrency in jdk 27.