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📜  ScheduledExecutorService接口

📅  最后修改于: 2020-11-15 03:56:53             🧑  作者: Mango

java.util.concurrent.ScheduledExecutorService接口是ExecutorService接口的子接口，并支持将来和/或定期执行任务。

ScheduledExecutorService方法

Sr.No. Method & Description
1

ScheduledFuture schedule(Callable 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.

例

以下TestThread程序显示了在基于线程的环境中ScheduledExecutorService接口的用法。

现场演示
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。

输出

beep
beep
beep
beep