update

basis/concurrent/TestForkjoin.java

@@ -4,7 +4,7 @@ public class TestForkjoin {
     public static void main(String[] args) throws Exception {
         MyRecursiveTask fj = new MyRecursiveTask(1, 100000);
         ForkJoinPool pool = new ForkJoinPool();
-        Future future = pool.submit(fj);
+        Future<Integer> future = pool.submit(fj);
         System.out.println(future.get());
     }
 }