localdatetime 比较大小

LocalDateTime类实现了Comparable接口，因此可以使用compareTo()方法比较两个LocalDateTime对象的大小。如果第一个LocalDateTime对象早于第二个，则返回负数；如果第一个LocalDateTime对象晚于第二个，则返回正数；如果两个LocalDateTime对象相等，则返回0。以下是比较两个LocalDateTime对象大小的示例代码：

LocalDateTime dateTime1 = LocalDateTime.of(2021, 10, 1, 10, 30);
LocalDateTime dateTime2 = LocalDateTime.of(2021, 10, 1, 11, 0);

int result = dateTime1.compareTo(dateTime2);

if (result < 0) {
    System.out.println(dateTime1 + " is earlier than " + dateTime2);
} else if (result > 0) {
    System.out.println(dateTime1 + " is later than " + dateTime2);
} else {
    System.out.println(dateTime1 + " is equal to " + dateTime2);
}

输出结果为：

2021-10-01T10:30 is earlier than 2021-10-01T11:00