Calendar roll(int calndr_field, int amt) method in Java with Examples

The roll(int calndr_field, int amt) method in Calendar class is used to operate on the passed calendar field by adding the passed amount to a specific calendar field without the alteration of large field values.
Note: The positive amount must be added and the negative amount must be subtracted.

Syntax:

public void roll(int calndr_field, int amt)



Parameters: The method takes two parameters:

  1. calndr_field: This is of Calendar type and refers to the field of the calendar that is to be operated upon.
  2. amt: This is of the Integer type that is to be added or subtracted depending upon the sign of the value.

Return Value: The method does not return any value.

Below programs illustrate the working of roll() Method of Calendar class:
Example 1:

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// Java code to illustrate
// isSet() method
  
import java.util.*;
public class Calendar_Demo {
    public static void main(String args[])
    {
  
        // Creating a calendar
        Calendar calndr = Calendar.getInstance();
  
        // Displaying the year
        System.out.println("The Current Year"
                           + " is: "
                           + calndr.get(
                                 Calendar.YEAR));
  
        // Decrementing the year
        // by 5
        calndr.roll(Calendar.YEAR, -5);
  
        // Displaying the result after the operation
        System.out.println("The New Year is: "
                           + calndr.get(
                                 Calendar.YEAR));
  
        // Incrementing the year
        // by 2
        calndr.roll(Calendar.YEAR, 2);
  
        // Displaying the result after operation
        System.out.println("The new year is: "
                           + calndr.get(
                                 Calendar.YEAR));
    }
}

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Output:

The Current Year is: 2019
The New Year is: 2014
The new year is: 2016

Example 2:

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// Java code to illustrate
// isSet() method
  
import java.util.*;
public class Calendar_Demo {
    public static void main(String args[])
    {
  
        // Creating a calendar
        Calendar calndr = Calendar.getInstance();
  
        // Displaying the month
        System.out.println("The Current Month"
                           + " is: "
                           + calndr.get(
                                 Calendar.MONTH));
  
        // Incrementing the month
        // by 3
        calndr.roll(Calendar.MONTH, 3);
  
        // Displaying the result after operation
        System.out.println("The New Month is: "
                           + calndr.get(
                                 Calendar.MONTH));
  
        // Decrementing the month
        // by 1
        calndr.roll(Calendar.MONTH, -1);
  
        // Displaying the result after operation
        System.out.println("The new month is: "
                           + calndr.get(
                                 Calendar.MONTH));
    }
}

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Output:

The Current Month is: 2
The New Month is: 5
The new month is: 4

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Calendar.html#roll(int, %20int)



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