Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:08:50 +00:00
commit f59c1de96d
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+$ javac --enable-preview --release 27 Dominated.java      (JDK 27)
+Dominated.java:9: error: this case label is dominated by a preceding case label
+            case int primitive -> "an int";        // dominated: every Integer is already caught above
+                 ^
+1 error
+exit=1