how can i cancel/stop the bukkit runnable

hello i've been trying for 2 days i tried and searched in every website
please someone tell me how can i stop this bukkit runnable task
why the cancel(): not working

Code:

public class stest extends JavaPlugin {
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        Player player = (Player) sender;
        new BukkitRunnable() {
        
        
        @Override
    
        public void run() {
            if (cmd.getName().equalsIgnoreCase("Srun")) {
                for(Player online : Bukkit.getOnlinePlayers()) {
                
                    player.teleport(online);
                    online.teleport(player);
                
                
                }
            
            }
            if (cmd.getName().equalsIgnoreCase("Sstop")) {
                this.cancel();
            }
        
        }
    
    }.runTaskTimer(this, 60, 60);
    return true;
}
}

 

@BasimTM cancel isn't working (in your case) because you aren't calling it on the first runnable that you schedule the first time. You are canceling a second one.
To cancel the first one, you must somehow keep track of the first runnable and cancel that.