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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+import java.lang.LazyConstant;
+
+/**
+ * JDK 26 code for the lazy constants preview. It compiles on 26 and fails on 27:
+ * LazyConstant.orElse(...) and LazyConstant.isInitialized() were removed in the third preview.
+ * Driven by scripts/broken-on-27.sh.
+ */
+public class Lazy26 {
+    static final LazyConstant<String> GREETING = LazyConstant.of(() -> "hello");
+
+    public static void main(String[] args) {
+        if (!GREETING.isInitialized()) {
+            System.out.println("not yet: " + GREETING.orElse("<unset>"));
+        }
+        System.out.println(GREETING.get());
+    }
+}