Get weekdays in order by locale

Question

I'm trying to see if we can get the weekdays in order by locale. For example in US locale, we'll start with Sunday, while FR will start with Monday (in the terms of Calendar). To make sense out of it, I'm making an alarm app with the weekdays where the alarm is repeated on certain days -

Here are weekdays are not in ordered that I'm seeing in

new DateFormatSymbols().getShortWeekdays();

0 = ""
1 = "Sun"
2 = "Mon"
3 = "Tue"
4 = "Wed"
5 = "Thu"
6 = "Fri"
7 = "Sat"

0 = ""
1 = "dim."
2 = "lun."
3 = "mar."
4 = "mer."
5 = "jeu."
6 = "ven."
7 = "sam."

Answer 1

java.time

public static void printWeekdays(Locale loc) {
    WeekFields wf = WeekFields.of(loc);
    DayOfWeek day = wf.getFirstDayOfWeek();
    for (int i = 0; i < DayOfWeek.values().length; i++) {
        System.out.println(day.getDisplayName(TextStyle.SHORT, loc));
        day = day.plus(1);
    }
}

Let’s try it out:

    printWeekdays(Locale.US);

The output from this call is:

Sun
Mon
Tue
Wed
Thu
Fri
Sat

Or in French:

    printWeekdays(Locale.FRANCE);

Now Monday/lundi comes first, and in French, of course:

lun.
mar.
mer.
jeu.
ven.
sam.
dim.

Question: Can I use java.time on Android?

Yes, java.time works nicely on older and newer Android devices. It just requires at least Java 6.

• In Java 8 and later and on newer Android devices (from API level 26) the modern API comes built-in.
• In Java 6 and 7 get the ThreeTen Backport, the backport of the new classes (ThreeTen for JSR 310; see the links at the bottom).
• On (older) Android use the Android edition of ThreeTen Backport. It’s called ThreeTenABP. And make sure you import the date and time classes from org.threeten.bp with subpackages.

Links

• Oracle tutorial: Date Time explaining how to use java.time.
• Java Specification Request (JSR) 310, where java.time was first described.
• ThreeTen Backport project, the backport of java.time to Java 6 and 7 (ThreeTen for JSR-310).
• ThreeTenABP, Android edition of ThreeTen Backport
• Question: How to use ThreeTenABP in Android Project, with a very thorough explanation.