java中比较时间

 String time1= "2020-12-08 12:12:23";
 String time2= "2020-12-08 12:12:24";
 SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 Data startTime = sf.parse(time1);
 Data endTime = sf.parse(time2);
 if(timeStart.compareTo(timeEnd) > 0){
	System.out.println("开始时间大于结束时间");
}