JEP 506: Scoped Values

Author: ibrahimatay

README.md

@@ -11,9 +11,10 @@ This repository contains Java examples that are designed to track and document t
 ## Specifications & Practices
 
 * [Java 25](java-25/) (September, 2025)
-    * [JEP 513](java-25/src/main/java/JEP513FlexibleConstructorBodies.java): Flexible Constructor Bodies
-    * [JEP 512](java-25/src/main/java/JEP512CompactSourceFilesAndInstanceMainMethods.java): Compact Source Files and Instance Main Methods
+  * [JEP 513](java-25/src/main/java/JEP513FlexibleConstructorBodies.java): Flexible Constructor Bodies
+  * [JEP 512](java-25/src/main/java/JEP512CompactSourceFilesAndInstanceMainMethods.java): Compact Source Files and Instance Main Methods
   * [JEP 511](java-25/src/main/java/JEP511ModuleImportDeclarations.java): Module Import Declarations
+  * [JEP 506](java-25/src/main/java/JEP506ScopedValues.java): Scoped Values
 
 * [Java 24](java-24/) (March, 2025)
   * [JEP 488](java-24/src/main/java/JEP488PrimitiveTypesInPatternsInstanceofAndSwitch.java): Primitive Types in Patterns, instanceof, and switch

java-25/src/main/java/JEP506ScopedValues.java

@@ -0,0 +1,33 @@
+import static java.lang.ScopedValue.where;
+
+static final ScopedValue<String> CONTEXT = ScopedValue.newInstance();
+
+// JEP 506: Scoped Values
+// https://openjdk.org/jeps/506
+
+void main() {
+    where(CONTEXT, "CTX-12345").run(() -> {
+        foo();
+        bar();
+    });
+
+    /*
+    foo sees context: CTX-12345
+    bar sees context: CTX-12345
+    bar->nested sees: CTX-OVERRIDE
+    bar after nested sees: CTX-12345
+    * */
+}
+
+static void foo() {
+    System.out.println("foo sees context: " + CONTEXT.get());
+}
+
+static void bar() {
+    System.out.println("bar sees context: " + CONTEXT.get());
+    // Nested binding
+    where(CONTEXT, "CTX-OVERRIDE").run(() -> {
+        System.out.println("bar->nested sees: " + CONTEXT.get());
+    });
+    System.out.println("bar after nested sees: " + CONTEXT.get());
+}