java get first day of the week

To get the first day of the week in Java, you can use the getFirstDayOfWeek method of the Calendar class.

Here is an example:

Calendar cal = Calendar.getInstance();
int firstDayOfWeek = cal.getFirstDayOfWeek();

The getFirstDayOfWeek method returns an integer representing the first day of the week, where Sunday is represented by 1 and Saturday is represented by 7.

You can then use this value to determine the name of the first day of the week. For example:

String firstDayOfWeekName;
switch (firstDayOfWeek) {
    case Calendar.SUNDAY:
        firstDayOfWeekName = "Sunday";
        break;
    case Calendar.MONDAY:
        firstDayOfWeekName = "Monday";
        break;
    case Calendar.TUESDAY:
        firstDayOfWeekName = "Tuesday";
        break;
    case Calendar.WEDNESDAY:
        firstDayOfWeekName = "Wednesday";
        break;
    case Calendar.THURSDAY:
        firstDayOfWeekName = "Thursday";
        break;
    case Calendar.FRIDAY:
        firstDayOfWeekName = "Friday";
        break;
    case Calendar.SATURDAY:
        firstDayOfWeekName = "Saturday";
        break;
    default:
        firstDayOfWeekName = "Invalid day of week";
        break;
}

This code will assign the name of the first day of the week (e.g. "Monday") to the firstDayOfWeekName variable.