ScheduledFuture 例子 API代码

以下是一个带方法的类，它设置了 ScheduledExecutorService ，在 6秒内每 1 秒钟蜂(beep)鸣一次： 

import static java.util.concurrent.TimeUnit.*;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;

public class BeeperControl {
	private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);

	public void beepForAnHour() {
		final Runnable beeper = new Runnable() {
			public void run() {
				System.out.println("beep");
			}
		};
		//0延时，每1秒执行下beeper的任务
		final ScheduledFuture beeperHandler = scheduler.scheduleAtFixedRate(beeper, 0, 1, SECONDS);
		//执行6秒后，取消beeperHandler任务的执行并退出程序
		scheduler.schedule(new Runnable() {
			public void run() {
				beeperHandler.cancel(true);
				System.exit(0);
			}
		}, 6, SECONDS);
	}

	public static void main(String[] args) {
		new BeeperControl().beepForAnHour();
	}
}