java关于Date日期类型的大小比较

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);
    
    int compareTo = date1.compareTo(date2);
    
    System.out.println(compareTo);
    
} catch (ParseException e) {
    e.printStackTrace();
}

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();
}

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();
}