Java - How to run a task periodically
In this section, we will show you how to run a task periodically in Java.
1. ScheduledTask.java
import java.util.TimerTask;
import java.util.Date;
// Create a class extends with TimerTask
public class ScheduledTask extends TimerTask {
// to display current time
Date now;
// Add your task here
public void run() {
// initialize date
now = new Date();
// Display current time
System.out.println("Time is :" + now);
}
}
2. Run Scheduler Task
A class to run above scheduler task.
import java.util.Timer;
//Main class
public class SchedulerMain {
public static void main(String args[])
throws InterruptedException {
// Instantiate Timer Object
Timer time = new Timer();
// Instantiate SheduledTask class
ScheduledTask st = new ScheduledTask();
// Create Repetitively task for every 2 secs
time.schedule(st, 0, 2000);
//for demo only.
for (int i = 0; i <= 5; i++) {
System.out.println("Execution in Main Thread...." + i);
Thread.sleep(2000);
if (i == 5) {
System.out.println("Application Terminates");
System.exit(0);
}
}
}
}
Console Output:
Time is :Fri Jan 20 23:13:15 IST 2023 Execution in Main Thread....0 Time is :Fri Jan 20 23:13:17 IST 2023 Execution in Main Thread....1 Time is :Fri Jan 20 23:13:19 IST 2023 Execution in Main Thread....2 Time is :Fri Jan 20 23:13:22 IST 2023 Execution in Main Thread....3 Time is :Fri Jan 20 23:13:24 IST 2023 Execution in Main Thread....4 Time is :Fri Jan 20 23:13:26 IST 2023 Execution in Main Thread....5 Time is :Fri Jan 20 23:13:28 IST 2023 Application Terminates
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