java线程之异步回调

  public static void main(String[] args) throws ExecutionException, InterruptedException {
        //    异步调用，没有返回值
        CompletableFuture completableFuture1 = CompletableFuture.runAsync(() -> {
            System.out.println(Thread.currentThread().getName()+"completableFuture1");
        });

    //异步调用有返回值
        CompletableFuture completableFuture2=CompletableFuture.supplyAsync(()->{
            System.out.println(Thread.currentThread().getName()+"completableFuture2");
            return 12306;
        });
        System.out.println(completableFuture2.get());
        
        CompletableFuture completableFuture3=CompletableFuture.supplyAsync(()->{
            System.out.println(Thread.currentThread().getName()+"completableFuture3");
            int a=1/0;
            return 12306;
        });
        Integer integer = completableFuture3.whenComplete((num, error) -> {
            System.out.println("num:" + num);
            System.out.println("error:" + error);
        }).get();
        System.out.println(integer);
    }