java重置Timer执行频率

 public class BallUtil {
     public static  Timer fisTimer ;

     public static void fisStartBall(){
         long firstTime = 2000l;
         long time = 2000l;
         if(fisTimer==null){
             fisTimer = new Timer();
         }
         fisTimer.scheduleAtFixedRate(new TimerTask(){
             public void run(){
                 System.out.println("time="+time+"-----firstTime="+"定时器执行"+"----type="+type);
                 Date date = new Date();
                 int hour = date.getHours();
                 if(hour==9){
                         System.out.println("重置频率");
                         stop();//关闭后再开启
                         start();
                         //直接更新新的时间
                         //Long newTime = patt.getInt("INTERVDAY")*60l*1000;
                         //resetPeriod(newTime);
                 }
             }
             //此方法也可以重置频率，直接传入新的时间
             public void resetPeriod(final long time) throws IllegalArgumentException, IllegalAccessException{
                 Field[] fields = this.getClass().getSuperclass() .getDeclaredFields();
                    for (Field field : fields)
                    {
                        if (field.getName().endsWith("period"))
                        {
                            if (!field.isAccessible())
                            {
                                field.setAccessible(true);
                            }
                            field.set(this, time);
                        }
                    }
             }
         }, firstTime, time);
     }
     public  static void start(){
             fisStartBall();
     }

     public static void stop(){
             fisTimer.cancel();
     }
 }