Calendar setFirstDayOfWeek() Method in Java with Examples

Last Updated : 21 Feb, 2019
The setFirstDayOfWeek(int day_val) method in Calendar class is used to set the first day of the week using the day_val in this Calendar. Syntax: 
public void set(int day_val)
Parameters: The method takes one parameter day_val of integer type and refers to the first day of the week. Return Value: The method does not return any value. Below programs illustrate the working of setFirstDayOfWeek() Method of Calendar class: Example 1: Java 
// Java code to illustrate
// setFirstDayOfWeek() method

import java.util.*;

public class Calendar_Demo {
    public static void main(String args[])
    {

        // Creating calendar object
        Calendar calndr = Calendar.getInstance();

        // Displaying first day of the week
        int first_day = calndr.getFirstDayOfWeek();
        System.out.println("The Current"
                           + " First day of the week: "
                           + first_day);

        // Changing the first day of week
        calndr.setFirstDayOfWeek(Calendar.THURSDAY);

        // Displaying the alternate day
        first_day = calndr.getFirstDayOfWeek();
        System.out.println("The new first"
                           + " day of the week: "
                           + first_day);
    }
}
Output: 
The Current First day of the week: 1
The new first day of the week: 5
Example 2: Java 
// Java code to illustrate
// setFirstDayOfWeek() method

import java.util.*;
public class Calendar_Demo {
    public static void main(String args[])
    {

        // Creating calendar object
        Calendar calndr
            = new GregorianCalendar(2018, 6, 10);

        // Displaying first day of the week
        int first_day = calndr.getFirstDayOfWeek();
        System.out.println("The"
                           + " First day of the week: "
                           + first_day);

        // Changing the first day of week
        calndr.setFirstDayOfWeek(Calendar.MONDAY);

        // Displaying the alternate day
        first_day = calndr.getFirstDayOfWeek();
        System.out.println("The new first"
                           + " day of the week: "
                           + first_day);
    }
}
Output: 
The First day of the week: 1
The new first day of the week: 2
Reference: https://docs.oracle.com/javase/8/docs/api/java/util/Calendar.html#setFirstDayOfWeek-int-
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