java设置按时间自动执行

import java.util.Timer;  
import java.util.TimerTask;  
public class EggTimer {     
    private final Timer timer = new Timer();  
    private final int minutes;  
    public EggTimer(int minutes) {   
       this.minutes = minutes;  
    }  
    public void start() {   
       timer.schedule(new TimerTask() {   
           public void run() {   
               playSound();   
               timer.cancel();  
               EggTimer eggTimer = new EggTimer(2);   
               eggTimer.start();  
            }   
           private void playSound() {   
               System.out.println("Your egg is ready!");  
                // Start a new thread to play a sound...  
            }   
       }, minutes * 1 * 1000);  
    }   
   public static void main(String[] args) {   
       EggTim