如何在 Java 中返回 LocalTime 的总和

Question

It wont get the minutes. i need to return minutes. How to return sum of minutes while iterating over Localtime in Java?

public String userLunchHoursSum(String username) {
    List<WorkHour> workHours = workHourRepository.findWorkHoursByUsername(username);
    System.out.println(Arrays.toString(workHours.toArray()));
    long diff = 0;
    LocalTime lunchTime;
    long minutes = 0;
    LocalTime plusMinutes = null;
    for (WorkHour workHour : workHours) {
        lunchTime = workHour.getLunch_time().toLocalTime(); //00:30:00
        plusMinutes = lunchTime.plusMinutes(lunchTime.getMinute());
    }
    if(workHours.size()!= 0) {
        return Long.toString(plusMinutes.getMinute());
    }
    return "00:00";
}

getLunch_time returns java.sql.Time .

Answer 1

As mentioned, you should be storing duration instead of localtime. If this is something you have no control over, consider migrating the database or creating a intermediate parsing function. Example code that I have not run, because I don't know what is in WorkHour .

// leave the string formatting to other functions
public long userLunchHoursSum(String username) {
    List<WorkHour> workHours = workHourRepository.findWorkHoursByUsername(username);
    Duration totalDuration = Duration.ZERO;
    for (WorkHour workHour : workHours) {
        // save your time in the appropriate format beforehand
        // do not use local time to store duration.
        Duration lunchTime = Duration.between(LocalTime.MIDNIGHT, workHour.getLunch_time().toLocalTime()); //00:30:00
        totalDuration = totalDuration.plus(lunchTime);
    }
    return totalDuration.toMinutes();
}