fix: update structured concurrency example to Java 26 Joiner API

Signed-off-by: https://github.com/Someshdiwan <someshdiwan369@gmail.com>

Author: Someshdiwan

Java-Versions/Java 26/src/Test1.java …va 26/src/StructuredConcurrencyDemo.javaJava-Versions/Java 26/src/Test1.java renamed to Java-Versions/Java 26/src/StructuredConcurrencyDemo.java Java-Versions/Java 26/src/Test1.java renamed to Java-Versions/Java 26/src/StructuredConcurrencyDemo.java

@@ -1,6 +1,6 @@
 import java.util.concurrent.StructuredTaskScope;
 
-public class Test1 {
+public class StructuredConcurrencyDemo {
     public static void main(String[] args) {
 
         try (var scope = new StructuredTaskScope.ShutdownOnFailure()) {
@@ -28,6 +28,12 @@ static String fetchData(String name) throws InterruptedException {
 /*
 What changed: Previous vs New
 
+Java 26 note:
+StructuredTaskScope API changed from older ShutdownOnFailure style
+to the new open(...) + Joiner style.
+
+
+
 Previous Java style:
 - Usually we used ExecutorService + Future
 - We manually submitted tasks