Javaで2つの日付の間の営業日数を計算するにはどうすればよいですか?

<code class="java">import java.time.LocalDate;
import java.time.temporal.ChronoUnit;

public class BusinessDaysCalculator {

    public static int getWorkingDaysBetweenTwoDates(LocalDate startDate, LocalDate endDate) {
        return (int) ChronoUnit.DAYS.between(startDate, endDate) - getWeekends(startDate, endDate);
    }

    private static int getWeekends(LocalDate startDate, LocalDate endDate) {
        return (int) Math.floor(ChronoUnit.DAYS.between(startDate, endDate) / 7) * 2;
    }
}</code>

<code class="java">import java.util.Calendar;

public class BusinessDaysCalculator {

    public static int getWorkingDaysBetweenTwoDates(Date startDate, Date endDate) {
        Calendar startCal = Calendar.getInstance();
        startCal.setTime(startDate);        

        Calendar endCal = Calendar.getInstance();
        endCal.setTime(endDate);

        int workDays = 0;

        if (startCal.getTimeInMillis() == endCal.getTimeInMillis()) {
            return 0;
        }
    
        if (startCal.getTimeInMillis() > endCal.getTimeInMillis()) {
            startCal.setTime(endDate);
            endCal.setTime(startDate);
        }

        do {
            startCal.add(Calendar.DAY_OF_MONTH, 1);
            if (startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SATURDAY && startCal.get(Calendar.DAY_OF_WEEK) != Calendar.SUNDAY) {
                ++workDays;
            }
        } while (startCal.getTimeInMillis() < endCal.getTimeInMillis()); 

        return workDays;
    }
}</code>