[BAEL-7073] code for executor service

core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/ExecuteExample.java

@@ -0,0 +1,25 @@
+package com.baeldung.concurrent.executorservice;
+
+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();
+
+  }
+
+}

core-java-modules/core-java-concurrency-simple/src/main/java/com/baeldung/concurrent/executorservice/SubmitExample.java

@@ -0,0 +1,34 @@
+package com.baeldung.concurrent.executorservice;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+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();
+    }
+    executorService.shutdown();
+  }
+}