JAVA EE: How to find the scheduled execution time of the most recent actual execution of the task

Wednesday, 6 February 2019

How to find the scheduled execution time of the most recent actual execution of the task

Click here to watch on Youtube:
https://www.youtube.com/watch?v=HTRdIh1A_rc&list=UUhwKlOVR041tngjerWxVccw

ReminderTimerTask.java

import java.util.TimerTask;

public class ReminderTimerTask extends TimerTask

{

    public void run()

    {

        System.out.println("Wake up...");

    }

}

TimerDemo.java

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

public class TimerDemo

{

    public static void main(String[] args) throws InterruptedException

    {

        Timer timer = new Timer();

        TimerTask reminderTimerTask = new ReminderTimerTask();

        timer.schedule(reminderTimerTask, 5000, 2000);

        System.out.println("Timer has schedule the reminderTimerTask...");

        /*
         * Returns:
         * 
         * the time at which the most recent execution of this task
         * was scheduled to occur, in the format returned by
         * Date.getTime(). The return value is undefined if the task
         * has yet to commence its first execution.
         */

        long scheduledExecutionTime = reminderTimerTask

                .scheduledExecutionTime();

        System.out.println(

                "scheduledExecutionTime = " + new Date(scheduledExecutionTime));

    }

}

Output:

Timer has schedule the reminderTimerTask...

scheduledExecutionTime = Sat Feb 02 09:18:20 IST 2019

Wake up...

Wake up...

Wake up...

Wake up...

Wake up...