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
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+/**
+ * Uses one API that exists on Java 26 and later (String.equalsFoldCase) and not on Java 25.
+ * Compiled by a newer javac with --release 25 (rejected) and with -source 25 -target 25 (accepted, then it
+ * fails when it meets a Java 25 runtime). Explained in docs/15-build-files.md.
+ */
+public class ReleaseFlag {
+    public static void main(String[] args) {
+        System.out.println("ABC".equalsFoldCase("abc"));
+    }
+}