Add lazy-constants module: LazyConstant (JEP 531) against the holder idiom and double-checked locking

Basics, failure semantics on 26 vs 27, lazy collections, API across 25/26/27, preview-flag traps and a JMH read-path benchmark (jars fetched and sha1-checked, not committed). Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01TF9JWFvJSNm6HVzswzZU5a
2026-09-24 12:27:27 +00:00
parent af44e59e7f
commit 814c32b5ce
25 changed files with 606 additions and 0 deletions
@@ -0,0 +1,7 @@
+public class RemovedApi {
+    public static void main(String[] args) {
+        LazyConstant<String> c = LazyConstant.of(() -> "x");
+        System.out.println(c.isInitialized());   // exists on JDK 26, removed in 27
+        System.out.println(c.orElse("fallback")); // exists on JDK 26, removed in 27
+    }
+}