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Java Executors newScheduledThreadPool()用法及代码示例


Executors 类的 newScheduledThreadPool() 方法创建了一个线程池，该线程池可以安排命令在给定延迟后运行或定期执行。

用法

Public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize)
public static ScheduledExecutorService newScheduledThreadPool(int corePoolSize, ThreadFactory threadFactory)

参数

corePoolSize - 要保留在池中的线​​程数，即使它们处于空闲状态

threadFactory - 执行程序创建新线程时使用的工厂

返回

新创建的调度线程池

抛出

NullPointerException

IllegalArgumentException

例子1

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ExecutorsnewSheduledThreadPoollExample1  {
	
   public static void main(final String[] arguments) throws InterruptedException {
       
    ScheduledExecutorService scheduler = Executors.newScheduledThreadPool( 3 );
       ThreadFactory ThreadFactory = Executors.defaultThreadFactory();
        System.out.println(scheduler.getClass());
      ExecutorService excr = Executors.newCachedThreadPool(ThreadFactory);
      ThreadPoolExecutor mypool = (ThreadPoolExecutor) excr;
      System.out.println("size of mypool:" + mypool.getPoolSize());
    
      excr.submit(new Threadimpl());
      
      excr.shutdown();
   }  

   static class Threadimpl implements Runnable {

      public void run() {
         
         try {
            Long num = (long) (Math.random() / 30);
            System.out.println("Thread Name:" +Thread.currentThread().getName());
               TimeUnit.SECONDS.sleep(num);
            System.out.println("after sleep Thread Name:" +Thread.currentThread().getName());
         } catch (InterruptedException e) {
            e.printStackTrace();
         }
      }
   }
}

输出：

class java.util.concurrent.ScheduledThreadPoolExecutor
size of mypool:0
Thread Name:pool-2-thread-1
after sleep Thread Name:pool-2-thread-1

例子2

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

public class ExecutorsnewSheduledThreadPoollExample2  {
	
   public static void main(final String[] arguments) throws InterruptedException {
       
    ScheduledExecutorService scheduler = Executors.newScheduledThreadPool( 3 );
       ThreadFactory ThreadFactory = Executors.defaultThreadFactory();
        System.out.println(scheduler.getClass());
      ExecutorService excr = Executors.newCachedThreadPool(ThreadFactory);
      ThreadPoolExecutor mypool = (ThreadPoolExecutor) excr;
      System.out.println("size of mypool:" + mypool.getPoolSize());
      
               System.out.println(scheduler.isShutdown());
                System.out.println(scheduler.getClass());
      excr.shutdown();
   }  

  
}

输出：

class java.util.concurrent.ScheduledThreadPoolExecutor
size of mypool:0
false
class java.util.concurrent.ScheduledThreadPoolExecutor




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注：本文由纯净天空筛选整理自 Java Executors newScheduledThreadPool() Method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。