Java TimerTask Class

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Introduction

The Java TimerTask class represents a task that can be scheduled for one-time or repeated execution by a Timer.

Class declaration

Following is the declaration for java.util.TimerTask class −

 public abstract class TimerTask extends Object implements Runnable 

Class constructors

Sr.No.	Constructor & Description
1	protected TimerTask() This constructor creates a new timer task.

Class methods

Sr.No.	Method & Description
1	boolean cancel() This method cancels this timer task.
2	abstract void run() This method represents the action to be performed by this timer task.
3	long scheduledExecutionTime() This method returns the scheduled execution time of the most recent actual execution of this task.

Methods inherited

This class inherits methods from the following classes −

• java.util.Object

Running a Timer Task for a given Schedule Example

The following example shows the usage of Java Timer run() method to run the timer operation as per schedule. 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.

 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); 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.

 working on working on working on working on working on working on