diff --git a/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/ExecuteExample.java b/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/ExecuteExample.java
index 8331ff84fc..6b6d6e3e8a 100644
--- a/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/ExecuteExample.java
+++ b/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/ExecuteExample.java
@@ -4,22 +4,21 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 public class ExecuteExample {
-  public static void main(String[] args)
-  {
-    ExecutorService executorService = Executors.newFixedThreadPool(2);
-    // Task using Runnable
-     Runnable task = () ->
-     {
-       int[] numbers = {1, 2, 3, 4, 5};
-       int sum = 0;
-       for (int num : numbers) {
-         sum += num;
-       }
-       System.out.println("Sum calculated using execute:" + sum);
-     };
-     // Submit the task using execute
-     executorService.execute(task); executorService.shutdown();
+    public static void main(String[] args) {
+        ExecutorService executorService = Executors.newFixedThreadPool(2);
+        // Task using Runnable
+        Runnable task = () -> {
+            int[] numbers = { 1, 2, 3, 4, 5 };
+            int sum = 0;
+            for (int num : numbers) {
+                sum += num;
+            }
+            System.out.println("Sum calculated using execute:" + sum);
+        };
+        // Submit the task using execute
+        executorService.execute(task);
+        executorService.shutdown();
 
-  }
+    }
 
 }
diff --git a/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/SubmitExample.java b/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/SubmitExample.java
index 93fa77be1d..cd715edcc0 100644
--- a/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/SubmitExample.java
+++ b/core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/SubmitExample.java
@@ -7,28 +7,25 @@ import java.util.concurrent.Executors;
 import java.util.concurrent.Future;
 
 public class SubmitExample {
-  public static void main(String[] args)
-  {
-    ExecutorService executorService = Executors.newFixedThreadPool(2);
-    Callable<Integer> task = () ->
-    {
-      int[] numbers = {1, 2, 3, 4, 5};
-      int sum = 0;
-      for (int num : numbers) {
-        sum += num;
-      }
-      return sum;
-    };
-    // Submit the task and obtain a Future
-    Future<Integer> result = executorService.submit(task);
-    try {
-      // Get the result
-       int sum = result.get();
-       System.out.println("Sum calculated using submit:" + sum);
-    } catch (InterruptedException | ExecutionException e)
-    {
-      e.printStackTrace();
+    public static void main(String[] args) {
+        ExecutorService executorService = Executors.newFixedThreadPool(2);
+        Callable<Integer> task = () -> {
+            int[] numbers = { 1, 2, 3, 4, 5 };
+            int sum = 0;
+            for (int num : numbers) {
+                sum += num;
+            }
+            return sum;
+        };
+        // Submit the task and obtain a Future
+        Future<Integer> result = executorService.submit(task);
+        try {
+            // Get the result
+            int sum = result.get();
+            System.out.println("Sum calculated using submit:" + sum);
+        } catch (InterruptedException | ExecutionException e) {
+            e.printStackTrace();
+        }
+        executorService.shutdown();
     }
-    executorService.shutdown();
-  }
 }
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