Java Calendar.roll(int field, boolean up)

public abstract void roll(int field, boolean up)

/*from   w  w w  .  j a v a2 s  .c om*/


import java.util.Calendar;

public class Main {

   public static void main(String[] args) {

      Calendar cal = Calendar.getInstance();

      // displays the current calendar
      System.out.println("Month is " + cal.get(Calendar.MONTH));

      // roll month
      cal.roll(Calendar.MONTH, true);

      // print result after rolling
      System.out.println("Month is " + cal.get(Calendar.MONTH));

      // roll downwards
      cal.roll(Calendar.MONTH, false);

      // print result after rolling down
      System.out.println("Month is " + cal.get(Calendar.MONTH));
   }
}