Java Calendar method setFirstDayOfWeek() to update the first day of week of a calendar

Calendar.setFirstDayOfWeek( int value) Update the first day of the week of a Calendar.
value : Integer ( required ) value from 1 to 7 to get update the first day of week

package my_proj;
 
import java.util.Calendar;
 
public class my_first {
public static void main(String[] args) {
Calendar my_cal = Calendar.getInstance();// created calendar
System.out.println(my_cal.getWeeksInWeekYear()); // 52
my_cal.setFirstDayOfWeek(1);
System.out.println(my_cal.getWeeksInWeekYear()); // 52
}
}

We used getFirstDayOfWeek() to get the value of first day of week.

If we update the input to setFirstDayOfWeek() to 5 or beyond then the output of getWeeksInWeekYear() will change.

package my_proj;
 
import java.util.Calendar;
 
public class my_first {
public static void main(String[] args) {
Calendar my_cal = Calendar.getInstance();// created calendar
System.out.println(my_cal.getWeeksInWeekYear()); // 52
my_cal.setFirstDayOfWeek(5);
System.out.println(my_cal.getWeeksInWeekYear()); // 53
}
}

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Java

Calendar.setFirstDayOfWeek()

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