between java.time.LocalTime (next day)

问题

Please suggest if there is an API support to determine if my time is between 2 LocalTime instances, or suggest a different approach.

I have this entity:

 class Place {
   LocalTime startDay;
   LocalTime endDay;
 }

which stores the working day start and end time, i.e. from '9:00' till '17:00', or a nightclub from '22:00' till "5:00".

I need to implement a Place.isOpen() method that determines if the place is open at a given time.

A simple isBefore/isAfter does not work here, because we also need to determine if the end time is on the next day.

Of course, we can compare the start and end times and make a decision, but I want something without additional logic, just a simple between() call. If LocalTime is not sufficient for this purpose, please suggest other.

回答1:

If I understand correctly, you need to make two cases depending on whether the closing time is on the same day as the opening time (9-17) or on the next day (22-5).

It could simply be:

public static boolean isOpen(LocalTime start, LocalTime end, LocalTime time) {
  if (start.isAfter(end)) {
    return !time.isBefore(start) || !time.isAfter(end);
  } else {
    return !time.isBefore(start) && !time.isAfter(end);
  }
}

回答2:

This looks cleaner for me:

 if (start.isBefore(end)) {
     return start.isBefore(date.toLocalTime()) && end.isAfter(date.toLocalTime());
 } else {
     return date.toLocalTime().isAfter(start) || date.toLocalTime().isBefore(end);
 }

回答3:

I have refactored @assylias answer so i use int instead of local time as i get open and close hour from api int integer format

public static boolean isOpen(int start, int end, int time) {
    if (start>end) {
        return time>(start) || time<(end);
    } else {
        return time>(start) && time<(end);
    }
}
public static boolean isOpen(int start, int end) {
    SimpleDateFormat sdf = new SimpleDateFormat("HH");
    Date resultdate = new Date();
    String hour = sdf.format(resultdate);
    int time = Integer.valueOf(hour);
    if (start>end) {
        return time>(start) || time<(end);
    } else {
        return time>(start) && time<(end);
    }
}

来源：https://stackoverflow.com/questions/35200991/between-java-time-localtime-next-day

标签

java

java-8

java-time

localtime