Remove a task from a ScheduledThreadPoolExecutor

Question

hi ,
i have a small program that creates a ScheduledThreadPoolExecutor , and insert one Runnable task into it.
the task should be preformed for given time and then cancelled.
but for some reason i can't remove the task from the thread pool , and it keeps on going.
here is my code :
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import java.util.Calendar;
public class TimeTest {
    private static ScheduledThreadPoolExecutor executor;
    private Runnable task;
    public TimeTest(){
        executor = new ScheduledThreadPoolExecutor(10);
        task = new MyTask(System.currentTimeMillis() +15000);//death time is 15 seconds from now
        executor.scheduleAtFixedRate(task, 5L, 5L, TimeUnit.SECONDS);
    public static void removeTaskFromThreadPool(Runnable task) {
        executor.remove(task);
    public static void main(String[] args) {
        new TimeTest();
    public class MyTask implements Runnable {
        private long deathTime;
        public MyTask(long deathTime){
            this.deathTime = deathTime;
        public void run() {
            if(deathTime - System.currentTimeMillis() > 5000){
                System.out.println("time = " + Calendar.getInstance().getTime());
            }else{
                System.out.println("removing MyTask");
                TimeTest.removeTaskFromThreadPool(this);
}thank in advance and a happy new year :-]

Answer 1

private static ScheduledThreadPoolExecutor executor;
private Runnable task;
private ScheduledFuture future;
executor.scheduleAtFixedRate(task, 5L, 5L, TimeUnit.SECONDS);
future = executor.scheduleAtFixedRate(task, 5L, 5L,  TimeUnit.SECONDS);
public static void
removeTaskFromThreadPool(Runnable task) {
executor.remove(task);
    future.cancel();