update comments

Author: fishercoder1534

src/main/java/multithread/completablefutureexamples/CompletableFutureDemo.java

@@ -19,16 +19,20 @@ public static void main(String... args) throws Exception {
 
     private static void runApp() throws InterruptedException, ExecutionException {
         Future<String> completableFuture = calculateAsync();
+        System.out.println("got completableFuture: " + completableFuture);
+        System.out.println("got completableFuture.isDone(): " + completableFuture.isDone());
         String result = completableFuture.get();
+        System.out.println("got completableFuture.isDone(): " + completableFuture.isDone());
         assertEquals("Hello", result);
     }
 
     private static Future<String> calculateAsync() {
         CompletableFuture<String> completableFuture = new CompletableFuture<>();
 
         Executors.newCachedThreadPool().submit(() -> {
-            Thread.sleep(1000);
             System.out.println("Doing some work in the thread now..");
+            Thread.sleep(1000);
+            System.out.println("Almost done working in the thread now..");
             completableFuture.complete("Hello");
             return null;
         });

src/main/java/multithread/completablefutureexamples/CompletableFutureDemo2.java

@@ -23,15 +23,16 @@ public static void main(String... args) throws ExecutionException, InterruptedEx
         List<Future<String>> futureList = new ArrayList<>();
         for (int i = 1; i <= NUMBER_OF_COMPUTATION_JOBS; i++) {
             Future<String> completableFuture = workerPool.executeAsync(i);
+            System.out.println("i = " + i + " and completableFuture.isDone() is: " + completableFuture.isDone());
             futureList.add(completableFuture);
         }
         for (Future<String> future : futureList) {
             String result = future.get();
             finalResult += Integer.parseInt(result);
         }
         long end = System.currentTimeMillis();
-        System.out.println("end: " + end);
-        System.out.println("start: " + start);
+        System.out.println("end time in millis: " + end);
+        System.out.println("start time in millis: " + start);
         System.out.println("It took " + (end - start) / 1000
                 + " seconds to complete computation, final result: " + finalResult
                 + ", a total of " + NUMBER_OF_COMPUTATION_JOBS + " computation jobs "