import java.time.DayOfWeek;
import java.time.LocalDate;
import java.time.temporal.TemporalAdjusters;
import java.time.temporal.WeekFields;
import java.util.List;
import java.util.Locale;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
 
public class Main {
    public static void main(String[] args) {
        // Let's test it
        System.out.println(getWeekDays(Locale.UK));
        System.out.println(getWeekDays(Locale.US));
    }
 
    static List<DayOfWeek> getWeekDays(Locale locale) {
        LocalDate localDate = LocalDate.now();
 
        // First day of week
        DayOfWeek firstDayOfWeek = WeekFields.of(locale).getFirstDayOfWeek();
 
        LocalDate date = localDate.with(TemporalAdjusters.dayOfWeekInMonth(0, firstDayOfWeek));
        return IntStream.rangeClosed(0, 6)
                    .mapToObj(i -> date.plusDays(i).getDayOfWeek())
                    .collect(Collectors.toList());
    }
}

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