有没有一种方法可以在不使用睡眠的情况下增加Java程序的延迟？

Question

In my game i have some stats that i want to go down after a certain period of time but i cant use the sleep thing. Can someone give me an example of a better way of doing this? I've seen videos on something called the swing timer but none of the videos are helping me much. I've also heard about the timer util however there seems to be almost no videos on that.

here's what I tried to do:

int hunger = 10;

 public void hungerDown(){
    try{
        Thread.sleep(5000);
        hunger--;
    }
    catch(Exception e){

    }
}

Answer 1

Are you trying to make a game? If so you should have a gameloop. This will keep track of timing, updates, and rendering. Here is a good website to get you started.

http://gafferongames.com/game-physics/fix-your-timestep/

Answer 2

ScheduledExecutorService execService = Executors.newSingleThreadScheduledExecutor();

public void hungerDown() {
    scheduledThreadPool.schedule(new Runnable() {
        hunger --;
    }, 5, TimeUnit.SECONDS);
}

Answer 3

Java has a mechanism TimerTask for this purpose. Eg,

long delayMs = 1000;
new Timer().schedule(
    new TimerTask() {
        @Override
        public void run() {
            /* your delayed logic */
        }
    },
    delayMs
);

Answer 4

Another option is to use ScheduledExecutorService and call ScheduledExecutorService.schedule(Callable<V> callable, long delay, TimeUnit unit) . You can get an instance by using one the factory methods from java.util.concurrent.Executors .

Answer 5

Unable to offer a code example right now but you may find a DelayQueue useful.

Essentially - you could create a DelayQueue and post a delayed item into it. Then fire up a Thread that just waits for something to come out of the queue.