Resettable Java Timer

According to the Timer documentation, in Java 1.5 onwards, you should prefer the ScheduledThreadPoolExecutor instead. (You may like to create this executor using Executors.newSingleThreadScheduledExecutor() for ease of use; it creates something much like a Timer.)

The cool thing is, when you schedule a task (by calling schedule()), it returns a ScheduledFuture object. You can use this to cancel the scheduled task. You're then free to submit a new task with a different triggering time.

ETA: The Timer documentation linked to doesn't say anything about ScheduledThreadPoolExecutor, however the OpenJDK version had this to say:

Java 5.0 introduced the java.util.concurrent package and one of the concurrency utilities therein is the ScheduledThreadPoolExecutor which is a thread pool for repeatedly executing tasks at a given rate or delay. It is effectively a more versatile replacement for the Timer/TimerTask combination, as it allows multiple service threads, accepts various time units, and doesn't require subclassing TimerTask (just implement Runnable). Configuring ScheduledThreadPoolExecutor with one thread makes it equivalent to Timer.

If your Timer is only ever going to have one task to execute then I would suggest subclassing it:

import java.util.Timer;import java.util.TimerTask;public class ReschedulableTimer extends Timer{    private Runnable  task;    private TimerTask timerTask;    public void schedule(Runnable runnable, long delay)    {        task = runnable;        timerTask = new TimerTask()        {            @Override            public void run()            {                task.run();            }        };        this.schedule(timerTask, delay);    }    public void reschedule(long delay)    {        timerTask.cancel();        timerTask = new TimerTask()        {            @Override            public void run()            {                task.run();            }        };        this.schedule(timerTask, delay);    }}

You will need to work on the code to add checks for mis-use, but it should achieve what you want. The ScheduledThreadPoolExecutor does not seem to have built in support for rescheduling existing tasks either, but a similar approach should work there as well.

The whole Code snippet goes like this .... I hope it will be help full

{        Runnable r = new ScheduleTask();        ReschedulableTimer rescheduleTimer = new ReschedulableTimer();        rescheduleTimer.schedule(r, 10*1000);    public class ScheduleTask implements Runnable {        public void run() {            //Do schecule task        }      }class ReschedulableTimer extends Timer {        private Runnable task;        private TimerTask timerTask;        public void schedule(Runnable runnable, long delay) {          task = runnable;          timerTask = new TimerTask() {               public void run() {                   task.run();                   }              };          timer.schedule(timerTask, delay);                }        public void reschedule(long delay) {            System.out.println("rescheduling after seconds "+delay);          timerTask.cancel();          timerTask = new TimerTask() {               public void run() {                   task.run();               }          };          timer.schedule(timerTask, delay);                }      }}