Callable vs Runnable

src/main/java/SubmitCallable.java

+import java.util.concurrent.*;
+
+public class SubmitCallable {
+    public static void main(String arg[]){
+        ExecutorService executorService = Executors.newSingleThreadExecutor();
+
+        Future future =executorService.submit(newRunnable(" Task")); //not blocked
+
+        System.out.println(future.isDone());
+        try {
+            String msg = (String) future.get(); //blocked
+            System.out.println(msg);
+        } catch (InterruptedException e) {
+            throw new RuntimeException(e);
+        } catch (ExecutionException e) {
+            throw new RuntimeException(e);
+        }
+        System.out.println(future.isDone());
+
+        executorService.shutdown();
+    }
+    private  static Callable newRunnable(String msg){
+        return new Callable() {
+            @Override
+            public Object call() throws Exception {
+                String report = Thread.currentThread().getName()+" :"+msg;
+
+                return report;
+            }
+        };
+        }
+}
+

src/main/java/SubmitRunnable.java

+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+public class SubmitRunnable {
+    public static void main(String arg[]){
+        ExecutorService executorService = Executors.newSingleThreadExecutor();
+
+            Future future =executorService.submit(newRunnable(" Task")); //not blocked
+
+            System.out.println(future.isDone());
+            try {
+                future.get(); //blocked
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            } catch (ExecutionException e) {
+                throw new RuntimeException(e);
+            }
+            System.out.println(future.isDone());
+
+        executorService.shutdown();
+    }
+    private  static  Runnable newRunnable(String msg){
+        return  new Runnable() {
+            @Override
+            public void run() {
+                String report = Thread.currentThread().getName()+" :"+msg;
+                System.out.println(report);
+            }
+        };
+    }
+}
+