Java ThreadPoolExecutor isShutdown() Method

The isShutdown() of ThreadPoolExecutor class returns true if this executor has been shut down otherwise it returns false.

Syntax

Parameters

No parameter is passed.

Return

It returns true if this executor has been shut down

Throw

Does not throw the exception.

Example 1

import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.lang.Thread;
public class ThreadPoolExecutorisShutdownExample1   {
    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());
            System.out.println(" Is Executor is shutdown :"+ executor.isShutdown());
           }  

      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
 Is Executor is shutdown :true
Running Thread Name: pool-1-thread-1
Running Thread Name: pool-1-thread-2
Completed Thread Name: pool-1-thread-2
Completed Thread Name: pool-1-thread-1

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 ThreadPoolExecutorisShutdownExample2 {
    public static void main(String[] args) {
             Work3 task1 = new Work3("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());
             System.out.println("get Task count after:"+ tExecutor.getTaskCount());
             tExecutor.shutdown(); // shutdown worker threads
             System.out.println(" Is Executor is shutdown :"+ tExecutor.isShutdown());
             System.out.println("Threads started, main ends\n");
          }
    }

 class Work3 implements Runnable {
         private final String threadName;
                 public Work3(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
get Task count after:2
 Is Executor is shutdown :true
Threads started, main ends

i=5

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