Java ThreadPoolExecutor allowsCoreThreadTimeOut() Method

The allowsCoreThreadTimeOut() method of ThreadPoolExecutor class returns true if this pool allows core threads to time out and terminate if no tasks arrive within the keepAlive time, being replaced if needed when new tasks arrive.

Syntax

Parameters

True if core threads are allowed to time out, else false

Return value

Return Boolean.

Throws

Does not throw the exception.

Example 1

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
public class ThreadPoolExecuteallowsCoreThreadTimeOutExample1  {
        public static void main(String[] args) {
		//Creating a thread pool
		ThreadPoolExecutor obj = new ThreadPoolExecuteallowsCoreThreadTimeOutExample1().new MyThreadExecutor(2, 3, 1,
		    TimeUnit.SECONDS, new LinkedBlockingQueue<>());  
		            obj.execute(() -> {
                                      System.out.println("In Runnable!");
                                           });
		                        obj.shutdown();
	                              }
   class MyThreadExecutor extends ThreadPoolExecutor {
   public MyThreadExecutor(int PoolSize, int maxPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue)
                          {
			        super(PoolSize, maxPoolSize, keepAliveTime, unit, workQueue);

			        if (this.allowsCoreThreadTimeOut())
                                {
                                      System.out.println("allowCoreThreadTimeOut  is  true");
                                      this.allowCoreThreadTimeOut(true);
                                }
                                            else
                                      System.out.println("allowCoreThreadTimeOut  is  false");
		            }
		   }
}

Test it Now

Output:

allowCoreThreadTimeOut  is  false
In Runnable!

Example 2

class MYThreadPoolExecutor4 extends ThreadPoolExecutor {
  public MYThreadPoolExecutor4() { 
        super(1,10,60,TimeUnit.SECONDS,new ArrayBlockingQueue<Runnable>(1000));
         this.allowCoreThreadTimeOut(false);
   }
   @Override
   protected void beforeExecute(Thread thread, Runnable run){
      super.beforeExecute(thread, run);
      if(this.allowsCoreThreadTimeOut())
      {
         try {
             Object Obj = ((Future<?>) run).get();
             System.out.println(Obj);
         } catch (InterruptedException | ExecutionException e) {  }
      }
      else{
          System.out.println("Allowtimeout is set to false");
      }
       }
   }
  public class ThreadPoolExecuteallowsCoreThreadTimeOutExample2  {
   public static void main(String args[]){
        System.out.println("creating service");
        MYThreadPoolExecutor4 obj2 = new MYThreadPoolExecutor4();
          Future<?> sb = obj2.submit(() -> {
           System.out.println("Welcome to main method");
        });
        obj2.shutdown();
    }
}

Test it Now

Output:

creating service
Allowtimeout is set to false
Welcome to main method

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