How to stop a running TimerTask

Question

I am trying to make a simple timer that plays a beep after the specified number of seconds. I managed to get it to work, but the TimerTask continues to run after the beep. Now do I stop execution? Here is my code:

import java.util.Scanner; import java.util.Timer; import java.util.TimerTask; import java.awt.Toolkit;  class Alarm {      public static void main(String[] args) {         long delay;         Scanner scan = new Scanner(System.in);         System.out.print("Enter a delay in seconds: ");         delay = scan.nextInt()*1000;          Timer timer = new Timer();          TimerTask task = new TimerTask() {             @Override             public void run() {                 Toolkit.getDefaultToolkit().beep();             }         };          timer.schedule(task, delay);     } } 

Answer 1

You need to cancel the timer by calling the following methods

timer.cancel();  // Terminates this timer, discarding any currently scheduled tasks. timer.purge();   // Removes all cancelled tasks from this timer's task queue. 

This will cancel the task, so something like this would work:

import java.util.Scanner; import java.util.Timer; import java.util.TimerTask; import java.awt.Toolkit;  class Alarm {      private static boolean run = true;      public static void main(String[] args) {         long delay;         Scanner scan = new Scanner(System.in);         System.out.print("Enter a delay in seconds: ");         delay = scan.nextInt()*1000;          final Timer timer = new Timer();          final TimerTask task = new TimerTask() {             @Override             public void run() {                 if(run) {                    Toolkit.getDefaultToolkit().beep();                 } else {                    timer.cancel();                    timer.purge();                 }             }         };          timer.schedule(task, delay);          // set run to false here to stop the timer.         run = false;     } } 

Answer 2

Here is what worked for me (used the purge() suggestion also):

import java.util.Scanner; import java.util.Timer; import java.util.TimerTask; import java.awt.Toolkit;  class Alarm {      public static void main(String[] args) {         long delay;         Scanner scan = new Scanner(System.in);         System.out.print("Enter a delay in seconds: ");         delay = scan.nextInt()*1000;          final Timer timer = new Timer();          final TimerTask task = new TimerTask() {             @Override             public void run() {                 Toolkit.getDefaultToolkit().beep();                 timer.cancel();                 timer.purge();             }         };          timer.schedule(task, delay);     } }