2. 40. 14. To increment or decrement a field of a calendar by 1 using the roll() method
By +1 or -1, depending on the second argument(true or false).
import java.util.Calendar; import java.util.GregorianCalendar; public class MainClass { public static void main(String[] a) {
GregorianCalendar calendar = new GregorianCalendar();
calendar.roll(Calendar.MONTH, false); // Go back a month
System.out.println(calendar.get(Calendar.MONTH));
}
}