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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+/**
+ * Tiny assertion helper so every demo is self-checking: a claim that stops being true turns the
+ * run red instead of quietly printing something different. Passing checks are echoed, so the
+ * transcript shows exactly what was verified.
+ */
+final class Check {
+    private Check() {}
+
+    static void that(boolean condition, String claim) {
+        if (!condition) {
+            throw new AssertionError("CHECK FAILED: " + claim);
+        }
+        System.out.println("CHECK ok   : " + claim);
+    }
+}