Java ThreadPoolExecutor shutdown() Method

The shutdown() method of ThreadPoolExecutor class initiates an orderly shutdown in which already submitted task is accepted, but no new task is accepted.

Syntax

Parameters

Return

Throw

SecurityException

Example 1

import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.lang.Thread;
public class ThreadPoolExecutorShutdownExample1  {
   public static void main(final String[] arguments) throws InterruptedException {
        ThreadPoolExecutor executor = (ThreadPoolExecutor)Executors.newCachedThreadPool();
       executor.submit(new Task());
       System.out.println(" Is Executor is shutdown :"+ executor.isShutdown());
        executor.submit(new Task());
        executor.shutdown();
        System.out.println("get Task count after:"+ executor.getTaskCount());
        executor.shutdown();
      }  
    static class Task implements Runnable {
      @Override
      public void run() {
          try {
              Long duration = (long) (Math.random() * 5);
              System.out.println("Running Thread Name: " + Thread.currentThread().getName());
              TimeUnit.SECONDS.sleep(duration);
              System.out.println("Completed Thread Name: " +Thread.currentThread().getName());
            } catch (InterruptedException e) {
              }
                   }
                                   }
}

Test it Now

Output:

Is Executor is shutdown :false
get Task count after:2
Running Thread Name: pool-1-thread-1
Running Thread Name: pool-1-thread-2
Completed Thread Name: pool-1-thread-1
Completed Thread Name: pool-1-thread-2

Example 2

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.lang.Thread;
import java.util.logging.Level;
import java.util.logging.Logger;
public class ThreadPoolExecutorShutdownExample2  {
         public static void main(String[] args) {
                     Work33 task1 = new Work33("t1");
                     System.out.println("Starting threads");
                     ThreadPoolExecutor tExecutor = (ThreadPoolExecutor) Executors.newCachedThreadPool();
                     System.out.println("  Maximum pool size: "+ tExecutor.getMaximumPoolSize());
                     System.out.println("get Task count before:"+ tExecutor.getTaskCount());
                     tExecutor.submit(task1); 
                     tExecutor.execute(task1); // start task1
                     System.out.println(" Is Executor is shutdown :"+ tExecutor.isShutdown());
                     tExecutor.shutdown(); // shutdown worker threads
                     tExecutor.isShutdown();
                     System.out.println("Threads started, main ends\n");
                  }
        }
 class Work33 implements Runnable {
              private final String threadName;
                public Work33(String threadName) {
                    this.threadName = threadName;
                  }
    @Override
  public void run() {
      for(int i=4 ; i<=9;i++)
      {
          if(i==5)
          {
              System.out.println("i=" +i);
              }
          }
          
      }
}

Test it Now

Output:

Starting threads
  Maximum pool size: 2147483647
get Task count before:0
 Is Executor is shutdown :false
i=5
Threads started, main ends
i=5

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