Java CompletableFuture: Trying to run two void methods as CompletableFuture and block until both complete

user_14064889 0
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I am trying to run two void method1 and method2 async and then block the code until both methods are done.

Does this achieve that?

      CompletableFuture<Void> future1 = CompletableFuture.runAsync(() -> method1());
      CompletableFuture<Void> future2 = CompletableFuture.runAsync(() -> method2());
      CompletableFuture.allOf(future1, future2).join();
completable-future java
2 Answers

I think code CompletableFuture.allOf(future1, future2).join(); should work fine. Could you try this, did you have any problems?

Or you can use something like:

  Arrays.asList(future1,future1).forEach(Future::get);
user_43188680

Why don't you use the dedicated method runAsync though?

   public static void main(String[] args) {
      CompletableFuture<Void> future1 = CompletableFuture.runAsync(() -> method1());
      CompletableFuture<Void> future2 = CompletableFuture.runAsync(() -> method2());

      CompletableFuture<Void> compound = CompletableFuture.allOf(future1, future2);
      compound.join();
      System.out.println("compound done");
}

And yes, your compound will be "joined" on the other thread (main in the example above), as such that compound done message will be printed only after both methods executed.

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