java获取当天初始结束时间

public class demo {
public static void main(String[] args)  {
 

    Calendar calendar = Calendar.getInstance();

   calendar.setTime(new Date());

   calendar.set(Calendar.HOUR_OF_DAY, 0);
   calendar.set(Calendar.MINUTE, 0);
   calendar.set(Calendar.SECOND, 0);
    
   Date start = calendar.getTime();
 
   calendar.add(Calendar.DAY_OF_MONTH, 1);
   calendar.add(Calendar.SECOND, -1);
    
   Date end = calendar.getTime();
    SimpleDateFormat sm = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    String starTime = sm.format(start);
    String endTime = sm.format(end);

   System.out.println(start);
   System.out.println(end);

}

}

2016-10-13 00:00:00

2016-10-13 23:59:59