java time 比较大小

在Java中，可以使用`compareTo()`方法或者`isBefore()`和`isAfter()`方法来比较时间的大小。下面是一些示例代码：

使用`compareTo()`方法：

LocalDateTime now = LocalDateTime.now();
LocalDateTime later = now.plusHours(5);

if (now.compareTo(later) < 0) {
    System.out.println("now is earlier than later");
} else if (now.compareTo(later) == 0) {
    System.out.println("now is equal to later");
} else {
    System.out.println("now is later than later");
}

使用`isBefore()`和`isAfter()`方法：

LocalDateTime now = LocalDateTime.now();
LocalDateTime later = now.plusHours(5);

if (now.isBefore(later)) {
    System.out.println("now is earlier than later");
} else if (now.isEqual(later)) {
    System.out.println("now is equal to later");
} else {
    System.out.println("now is later than later");
}

这些方法都可以用于比较`LocalDateTime`、`LocalDate`、`LocalTime`、`ZonedDateTime`等对象。