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
152 changed files with 5049 additions and 0 deletions
@@ -0,0 +1,16 @@
+$ javac --enable-preview --release 26 Lazy26.java      (JDK 26)
+exit=0
+
+$ javac --enable-preview --release 27 Lazy26.java      (JDK 27)
+Lazy26.java:12: error: cannot find symbol
+        if (!GREETING.isInitialized()) {
+                     ^
+  symbol:   method isInitialized()
+  location: variable GREETING of type LazyConstant<String>
+Lazy26.java:13: error: cannot find symbol
+            System.out.println("not yet: " + GREETING.orElse("<unset>"));
+                                                     ^
+  symbol:   method orElse(String)
+  location: variable GREETING of type LazyConstant<String>
+2 errors
+exit=1