java线程池死锁的产生及处理

final ExecutorService executorService =

        Executors.newSingleThreadExecutor();

Future<Long> f1 = executorService.submit(new Callable<Long>() {

    public Long call() throws Exception {

        System.out.println("start f1");

        Thread.sleep(1000);//延时

        Future<Long> f2 =

           executorService.submit(new Callable<Long>() {

            public Long call() throws Exception {

                System.out.println("start f2");

                return -1L;

            }

        });

        System.out.println("result" + f2.get());

        System.out.println("end f1");

        return -1L;

    }

});