Java Calendar setFirstDayOfWeek() Method

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Description

The Java Calendar setFirstDayOfWeek(int) method sets the first day of the week.

Declaration

Following is the declaration for java.util.Calendar.setFirstDayOfWeek() method

public void setFirstDayOfWeek(int value)

Parameters

value − The given first day of the week.

Return Value

This method does not return a value.

Exception

NA

Setting First Day of Week in a Current Dated Calendar Instance Example

The following example shows the usage of Java Calendar setFirstDayOfWeek(value) method. We're creating an instance of a Calendar of current date and print the first day of the week then using setFirstDayOfWeek() method, we're altering the first day of the week and print the altered one.

package com.tutorialspoint;

import java.util.Calendar;

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

      // create a calendar
      Calendar cal = Calendar.getInstance();

      // print current first day of the week
      int day = cal.getFirstDayOfWeek();
      System.out.println("Current first day of the week:" + day);

      // set first day of the week as something else
      cal.setFirstDayOfWeek(Calendar.WEDNESDAY);

      // print altered first day of the week
      day = cal.getFirstDayOfWeek();;
      System.out.println("Altered first day of the week:" + day);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Current first day of the week:1
Altered first day of the week:4

Setting First Day of Week in a Calendar Instance with GB locale Example

The following example shows the usage of Java Calendar setFirstDayOfWeek(value) method. We're creating an instance of a Calendar of current date using an en locale and print the first day of the week then using setFirstDayOfWeek() method, we're altering the first day of the week and print the altered one.

package com.tutorialspoint;

import java.util.Calendar;
import java.util.Locale;

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

      // create a calendar
      Calendar cal = Calendar.getInstance(new Locale("en", "GB"));

      // print current first day of the week
      int day = cal.getFirstDayOfWeek();
      System.out.println("Current first day of the week:" + day);

      // set first day of the week as something else
      cal.setFirstDayOfWeek(Calendar.WEDNESDAY);

      // print altered first day of the week
      day = cal.getFirstDayOfWeek();;
      System.out.println("Altered first day of the week:" + day);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Current first day of the week:2
Altered first day of the week:4

Setting First Day of Week in a Calendar Instance with CA locale Example

The following example shows the usage of Java Calendar setFirstDayOfWeek(value) method. We're creating an instance of a Calendar of current date using an fr locale and print the first day of the week then using setFirstDayOfWeek() method, we're altering the first day of the week and print the altered one.

package com.tutorialspoint;

import java.util.Calendar;
import java.util.Locale;

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

      // create a calendar
      Calendar cal = Calendar.getInstance(new Locale("fr", "CA"));

      // print current first day of the week
      int day = cal.getFirstDayOfWeek();
      System.out.println("Current first day of the week:" + day);

      // set first day of the week as something else
      cal.setFirstDayOfWeek(Calendar.WEDNESDAY);

      // print altered first day of the week
      day = cal.getFirstDayOfWeek();;
      System.out.println("Altered first day of the week:" + day);
   }
}

Output

Let us compile and run the above program, this will produce the following result −

Current first day of the week:1
Altered first day of the week:4