Java Date Time - Java GregorianCalendar.roll(int field, boolean up)

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Syntax

GregorianCalendar.roll(int field, boolean up) has the following syntax.

public void roll(int field, boolean up)

Example

In the following code shows how to use GregorianCalendar.roll(int field, boolean up) method.

/* www. j  a  v  a 2 s  .c  o  m*/
import java.util.*;

public class Main {

   public static void main(String[] args) {

      GregorianCalendar cal =
              (GregorianCalendar) GregorianCalendar.getInstance();

      // print the current date and time
      System.out.println(cal.getTime());

      // roll a month
      cal.roll(GregorianCalendar.MONTH, true);
      System.out.println("Date:" + cal.getTime());

      // roll a year backwards
      cal.roll(GregorianCalendar.YEAR, false);
      System.out.println("Date:" + cal.getTime());

   }
}

The code above generates the following result.

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