问题

// The kotlin function `delay()` has this specification:

// >  * Delays coroutine for a given time **without blocking a thread** and
// > resumes it after a specified time.  * This suspending function is
// > **cancellable**.  * If the [Job] of the current coroutine is cancelled or
// > completed while this suspending function is waiting, this function  *
// > immediately resumes with [CancellationException].

// I want to achieve the exact functionality using Java. Basically, I need to run
// a function using some delay and this should be cancellable anytime by some given condition.

// I've already gone through [this][1] thread, but most of the answers aren't quite
// the right fit for my scenario.

// [1]: https://stackoverflow.com/questions/3072173/how-to-call-a-method-after-a-delay-in-android

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答案1

得分: 2

你正在寻找ScheduledExecutorService。

// 创建调度器
ScheduledExecutorService scheduledExecutorService = 
    Executors.newScheduledThreadPool(1);

// 创建要执行的任务
Runnable r = new Runnable() {
    @Override
    public void run() {
        System.out.println("Hello");
    }
};

ScheduledFuture<?> scheduledFuture =
    scheduledExecutorService.schedule(r, 5, TimeUnit.SECONDS);

// 取消任务
scheduledFuture.cancel(false);

当你取消它时，会抛出InterruptedException异常。

 // Create the scheduler
    ScheduledExecutorService scheduledExecutorService = 
     Executors.newScheduledThreadPool(1);
    // Create the task to execute
    Runnable r = new Runnable() {
        @Override
        public void run() {
            System.out.println("Hello");
        }
    };
    ScheduledFuture<?> scheduledFuture =
        scheduledExecutorService. schedule(r, 5, TimeUnit.SECONDS);
  
    // Cancel the task
    scheduledFuture.cancel(false);