ExecutorService : isShutdown

boolean isShutdown()

Returns true if this executor has been shut down.

class WorkerThread implements Runnable{
 String taskName;

 WorkerThread(String taskName){
  this.taskName = taskName;
 }

 public String toString(){
  return taskName;
 }

 public void run(){
  try{
   Thread t1 = Thread.currentThread();
   System.out.println(t1.getName() + " executing the task " + taskName);
   t1.sleep(1000);
   System.out.println(t1.getName() + " completed the task " + taskName);
  }
  catch(Exception e){
   System.out.println(e);
  }
 }
}

   

class WorkerThread implements Runnable{
 String taskName;

 WorkerThread(String taskName){
  this.taskName = taskName;
 }

 public String toString(){
  return taskName;
 }

 public void run(){
  try{
   Thread t1 = Thread.currentThread();
   System.out.println(t1.getName() + " executing the task " + taskName);
   t1.sleep(1000);
   System.out.println(t1.getName() + " completed the task " + taskName);
  }
  catch(Exception e){
   System.out.println(e);
  }
 }
}

  

Output

pool-1-thread-2 executing the task task1
pool-1-thread-1 executing the task task0
pool-1-thread-3 executing the task task2
pool-1-thread-1 completed the task task0
pool-1-thread-3 completed the task task2
pool-1-thread-1 executing the task task3
pool-1-thread-3 executing the task task4
pool-1-thread-2 completed the task task1
pool-1-thread-1 completed the task task3
pool-1-thread-3 completed the task task4
Is the executor shut down true

   

ExecutorService exec = new ThreadPoolExecutor(3, 3, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>());

Above statement create a thread pool of size 5. So it can run 5 tasks at a time, Since 5 threads are reside in the pool.

exec.submit(tasks[i])

Submit the tasks to the thread pool. When the task is submitted, ThreadPool assigns a thread to execute the run method of the Runnable Object.

Shutdown the threadpool immediately                                                 Wait untill all tasks finish execution                                                 Home