方法一:java.util.Date类实现了Comparable接口，可以直接调用Date的compareTo()方法来比较大小 String beginTime = "2018-07-28 14:42:32"; String endTime = "2018-07-29 12:26:32"; SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { Date date1 = format.parse(beginTime); Date date2 = format.parse(endTime); int compareTo = date1.compareTo(date2); System.out.println(compareTo); } catch (ParseException e) { e.printStackTrace(); }compareTo()方法的返回值，date1小于date2返回-1，date1大于date2返回1，相等返回0
方法二：通过Date自带的before()或者after()方法比较 String beginTime = "2018-07-28 14:42:32"; String endTime = "2018-07-29 12:26:32"; SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { Date date1 = format.parse(beginTime); Date date2 = format.parse(endTime); boolean before = date1.before(date2); System.out.println(before); } catch (ParseException e) { e.printStackTrace(); }before()或者after()方法的返回值为boolean类型
方法三：通过调用Date的getTime()方法获取到毫秒数来进行比较 String beginTime = "2018-07-28 14:42:32"; String endTime = "2018-07-29 12:26:32"; SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); try { Date date1 = format.parse(beginTime); Date date2 = format.parse(endTime); long beginMillisecond = date1.getTime(); long endMillisecond = date2.getTime(); System.out.println(beginMillisecond > endMillisecond); } catch (ParseException e) { e.printStackTrace(); }原文链接：https://blog.csdn.net/lz199719/article/details/81261336