Add untyped transactor

akka-stm/src/test/java/akka/stm/example/RefExample.java

@@ -0,0 +1,35 @@
+package akka.stm.example;
+
+import akka.stm.*;
+
+public class RefExample {
+    public static void main(String[] args) {
+        System.out.println();
+        System.out.println("Ref example");
+        System.out.println();
+
+        final Ref<Integer> ref = new Ref<Integer>(0);
+
+        Integer value1 = new Atomic<Integer>() {
+            public Integer atomically() {
+                return ref.get();
+            }
+        }.execute();
+
+        System.out.println("value 1: " + value1);
+
+        new Atomic() {
+            public Object atomically() {
+                return ref.set(5);
+            }
+        }.execute();
+
+        Integer value2 = new Atomic<Integer>() {
+            public Integer atomically() {
+                return ref.get();
+            }
+        }.execute();
+
+        System.out.println("value 2: " + value2);
+    }
+}