Java Executors newScheduledThreadPool() Method

The newScheduledThreadPool() method of Executors class creates a thread pool that can schedule commands to run after a given delay or to execute periodically.

Syntax

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

Parameter

corePoolSize - the number of threads to keep in the pool, even if they are idle

threadFactory - the factory to use when the executor creates a new thread

Returns

a newly created scheduled thread pool

Throw

NullPointerException

IllegalArgumentException

Example 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();
         }
      }
   }
}

Test it Now

Output:

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

Example 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();
   }  

  
}

Test it Now

Output:

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

Next TopicJava Executors

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