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();
}