Java TimerTask scheduledExecutionTime() Method

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Description

The scheduledExecutionTime() method is used to return the scheduled execution time of the most recent actual execution of this task.

Declaration

Following is the declaration for java.util.TimerTask.scheduledExecutionTime() method.

public long scheduledExecutionTime()

Parameters

NA

Return Value

The method call returns the time at which the most recent execution of this task was scheduled to occur.

Exception

NA

Running a Timer Scheduled At Fixed Rate Example

The following example shows the usage of Java Timer scheduledExecutionTime() method to print the time of execution of most recent execution of the task. We've created a timer object using a CustomTimerTask object. CustomTimerTask is custom class extending TimerTask class and implements the run() method which will execute at scheduled time. Then we created a timer object and scheduled a task using scheduleAtFixedRate() to execute at every 100 milliseconds starting from now. Then we've printed the time of execution using scheduledExecutionTime() method.

package com.tutorialspoint;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class TimerTaskDemo {
   public static void main(String[] args) {

      // creating timer task, timer
      TimerTask tasknew = new CustomTimerTask();
      Timer timer = new Timer();

      // scheduling the task
      timer.scheduleAtFixedRate(tasknew, new Date(), 100);
      
      // checking scheduled execution time
      System.out.println("Time is :"+tasknew.scheduledExecutionTime());

      try {
         Thread.sleep(500);
      } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
}

class CustomTimerTask extends TimerTask {

   @Override
   public void run() {
      System.out.println("working on");
   }  
}

Output

Let us compile and run the above program, this will produce the following result.

Time is :1675410212458
working on
working on
working on
working on
working on
working on

Running a Timer as Daemon Process Scheduled At Fixed Rate Example

The following example shows the usage of Java Timer scheduledExecutionTime() method to print the time of execution of most recent execution of the task. We've created a timer object using a CustomTimerTask object. CustomTimerTask is custom class extending TimerTask class and implements the run() method which will execute at scheduled time. Then we created a timer object as a daemon thread and scheduled a task using scheduleAtFixedRate() to execute at every 100 milliseconds starting from now. Then we've printed the time of execution using scheduledExecutionTime() method.

package com.tutorialspoint;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class TimerTaskDemo {
   public static void main(String[] args) {

      // creating timer task, timer
      TimerTask tasknew = new CustomTimerTask();
      Timer timer = new Timer(true);

      // scheduling the task
      timer.scheduleAtFixedRate(tasknew, new Date(), 100);

      // checking scheduled execution time
      System.out.println("Time is :"+tasknew.scheduledExecutionTime());

      try {
         Thread.sleep(500);
      } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
}

class CustomTimerTask extends TimerTask {

   @Override
   public void run() {
      System.out.println("working on");
   }  
}

Output

Let us compile and run the above program, this will produce the following result.

Time is :1675410564119
working on
working on
working on
working on
working on
working on

Running a Named Timer as Daemon Process Scheduled At Fixed Rate Example

The following example shows the usage of Java Timer scheduledExecutionTime() method to print the time of execution of most recent execution of the task. We've created a timer object using a CustomTimerTask object. CustomTimerTask is custom class extending TimerTask class and implements the run() method which will execute at scheduled time. Then we created a timer object as a daemon thread, with a given name and scheduled a task using scheduleAtFixedRate() to execute at every 100 milliseconds starting from now. Then we've printed the time of execution using scheduledExecutionTime() method.

package com.tutorialspoint;

import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

public class TimerTaskDemo {
   public static void main(String[] args) {

      // creating timer task, timer
      TimerTask tasknew = new CustomTimerTask();
      Timer timer = new Timer("test",true);

      // scheduling the task
      timer.scheduleAtFixedRate(tasknew, new Date(), 100);
      
      // checking scheduled execution time
      System.out.println("Time is :"+tasknew.scheduledExecutionTime());

      try {
         Thread.sleep(500);
      } catch (InterruptedException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
}

class CustomTimerTask extends TimerTask {

   @Override
   public void run() {
      System.out.println("working on");
   }  
}

Output

Let us compile and run the above program, this will produce the following result.

Time is :1675410583664
working on
working on
working on
working on
working on
working on