1. 通过Date提供的compareTo()进行比较

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

2. 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。

3. 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();

}