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- Java.util - SimpleTimeZone
- Java.util - Stack
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- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
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- Java.util - Discussion
Java TimerTask Class
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
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