Using an ExecutorService to execute Runnables. - Java Thread

Java examples for Thread:ExecutorService

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Description

Using an ExecutorService to execute Runnables.

Demo Code

import java.util.concurrent.Executors;
import java.util.concurrent.ExecutorService;

import java.security.SecureRandom;

 class PrintTask implements Runnable 
{
   private final static SecureRandom generator = new SecureRandom();
   private final int sleepTime; // random sleep time for thread
   private final String taskName; // name of task
    /*from  w w  w .  j  ava 2  s.  c  o m*/
   // constructor
   public PrintTask(String taskName)
   {
      this.taskName = taskName;
        
      // pick random sleep time between 0 and 5 seconds
      sleepTime = generator.nextInt(5000); // milliseconds
   } 

   public void run() 
   {
      try // put thread to sleep for sleepTime amount of time 
      {
         System.out.printf("%s going to sleep for %d milliseconds.%n", 
            taskName, sleepTime);
         Thread.sleep(sleepTime); // put thread to sleep
      }       
      catch (InterruptedException exception)
      {
         exception.printStackTrace();
         Thread.currentThread().interrupt(); // re-interrupt the thread
      } 
        
      System.out.printf("%s done sleeping%n", taskName); 
   } 
}

public class Main
{
   public static void main(String[] args)
   {
      // create and name each runnable
      PrintTask task1 = new PrintTask("task1");
      PrintTask task2 = new PrintTask("task2");
      PrintTask task3 = new PrintTask("task3");
        
      System.out.println("Starting Executor");

      // create ExecutorService to manage threads
      ExecutorService executorService = Executors.newCachedThreadPool();

      // start the three PrintTasks
      executorService.execute(task1); // start task1  
      executorService.execute(task2); // start task2
      executorService.execute(task3); // start task3

      // shut down ExecutorService--it decides when to shut down threads
      executorService.shutdown(); 

      System.out.printf("Tasks started, main ends.%n%n");
   } 
}

Result


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