javademos/java21-features

java21-features — Java 21 features with examples

Companion code for the ankurm.com article Java 21 Features with Examples: Virtual Threads, Record Patterns, Sequenced Collections. The explanation lives in the article; this folder holds the runnable sources and the transcripts they produced. There is no docs/ folder: the depth is inside the article itself.

JDK21=/path/to/jdk21 ./run.sh      # regenerates output/*.txt

• src/ compiles and runs unchanged on the JDK named in each output header.
• broken/ fails to compile on purpose; the compiler's own message is committed in output/.
• output/ is real captured output, regenerated by run.sh.

Tested on: OpenJDK 21.0.12.1 (the preview and incubator demos need --enable-preview / --add-modules, which run.sh passes).