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:

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// 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);
    }
}

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Output:


The Current First day of the week: 1
The new first day of the week: 5





Example 2:











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// 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); 


    } 


} 



















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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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