Calendar setFirstDayOfWeek() Method in Java with Examples

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 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 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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