How to run a task every n seconds or periodically in Java
By Krishna LakhiHey Everyone! In this article, we will learn how we can execute or perform a particular task in Java every n seconds or periodically using the Timer and TimerTask classes.
Before directly jumping into the code, let us first understand about the TimerTask class used.
TimerTask class
TimerTask is an abstract class present in the java.util.TimerTask package in Java which implements the Runnable interface. As it is an abstract class it needs to be implemented and the run method of this class needs to be overridden.
This class is used to define a task to run every n seconds or run periodically or even for a single time.
This is done by creating an instance of the TimerTask class
Timer Class
The timer class is present in the java.util.Timer package in java.
This class consists of a method which schedules a task for a specified period of time.
Java Program to schedule a task periodically or for every n seconds
package taskn;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Taskn extends TimerTask {
public void run(){
System.out.println("Task scheduled ...executing now");
try {
Thread.sleep(3000);
} catch (InterruptedException ex) {
System.out.println(ex);
}
System.out.println("Timer task Done ");
}
public static void main(String args[]) throws Exception{
TimerTask timerTask = new Taskn(); //reference created for TimerTask class
Timer timer = new Timer(true);
timer.scheduleAtFixedRate(timerTask, 0, 10); // 1.task 2.delay 3.period
Thread.sleep(6000);
timer.cancel();
}
}
Output:-
Task scheduled ...executing now Timer task Done Task scheduled ...executing now Timer task Done
I hope the above article was useful to you.
Leave a comment down below for any doubts/suggestions.
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