Java Concurrency 简明教程
ScheduledExecutorService Interface
java.util.concurrent.ScheduledExecutorService 接口是 ExecutorService 接口的子接口，并支持任务的未来和/或定期执行。
A java.util.concurrent.ScheduledExecutorService interface is a subinterface of ExecutorService interface, and supports future and/or periodic execution of tasks.
ScheduledExecutorService Methods
Sr.No. |
Method & Description |
1 |
<V> ScheduledFuture<V> schedule(Callable<V> callable, long delay, TimeUnit unit) Creates and executes a ScheduledFuture that becomes enabled after the given delay. |
2 |
ScheduledFuture<?> schedule(Runnable command, long delay, TimeUnit unit) Creates and executes a one-shot action that becomes enabled after the given delay. |
3 |
ScheduledFuture<?> scheduleAtFixedRate(Runnable command, long initialDelay, long period, TimeUnit unit) Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given period; that is executions will commence after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on. |
4 |
ScheduledFuture<?> scheduleWithFixedDelay(Runnable command, long initialDelay, long delay, TimeUnit unit) Creates and executes a periodic action that becomes enabled first after the given initial delay, and subsequently with the given delay between the termination of one execution and the commencement of the next. |
Example
以下 TestThread 程序展示了在基于线程的环境中使用 ScheduledExecutorService 接口。
The following TestThread program shows usage of ScheduledExecutorService interface in thread based environment.
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
public class TestThread {
public static void main(final String[] arguments) throws InterruptedException {
final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
final ScheduledFuture<?> beepHandler =
scheduler.scheduleAtFixedRate(new BeepTask(), 2, 2, TimeUnit.SECONDS);
scheduler.schedule(new Runnable() {
@Override
public void run() {
beepHandler.cancel(true);
scheduler.shutdown();
}
}, 10, TimeUnit.SECONDS);
}
static class BeepTask implements Runnable {
public void run() {
System.out.println("beep");
}
}
}这将产生以下结果。
This will produce the following result.