diff --git a/modern-java/src/main/java/org/gym/fp/moderjava/ConcurrencyTest.java b/modern-java/src/main/java/org/gym/fp/moderjava/ConcurrencyTest.java
new file mode 100644
index 0000000..c801026
--- /dev/null
+++ b/modern-java/src/main/java/org/gym/fp/moderjava/ConcurrencyTest.java
@@ -0,0 +1,33 @@
+package org.gym.fp.moderjava;
+
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import static java.lang.System.out;
+
+public class ConcurrencyTest {
+
+    public static void main(String[] args) throws Exception {
+        doExecutorsServiceTest();
+    }
+
+    private static void doExecutorsServiceTest() throws ExecutionException, InterruptedException {
+        int x = 1337;
+        ExecutorService executorService = Executors.newFixedThreadPool(2);
+        Future<Integer> y = executorService.submit(() -> f(x));
+        Future<Integer> z = executorService.submit(() -> g(x));
+        out.println("Result y + z = " + (y.get() + z.get()));
+        executorService.shutdown();
+    }
+
+    static int f(int x) {
+        return 42;
+    }
+
+    static int g(int x) {
+        return x;
+    }
+
+}