To increment or decrement a field of a calendar by 1 using the roll() method : Gregorian Calendar « Data Type « Java Tutorial






  1. Java Tutorial
  2. Data Type
  3. Gregorian Calendar

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));
  }
}

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2.40.Gregorian Calendar
2.40.1.Creating Gregorian Calendars
2.40.2.Specifying the locale(TimeZone) explicitly for Gregorian Calendar
2.40.3.Creating a Calendar object from a locale
2.40.4.Creating a Date Object for a Particular Date
2.40.5.Setting the Date and Time
2.40.6.Setting a GregorianCalendar object to a particular date
2.40.7.Integer constants for the third version of set()
2.40.8.Calendar.DAY_OF_WEEK
2.40.9.Set with GregorianCalendar.YEAR, MONTH and DATE
2.40.10.Getting Date and Time Information: get the day of the week
2.40.11.Using a switch statement on the values for day
2.40.12.Modifying Dates and Times: adding 14 to the year
2.40.13.To go into the past: making the second argument negative in the 'add' method
2.40.14.To increment or decrement a field of a calendar by 1 using the roll() method
2.40.15.Comparing Calendars
2.40.16.Displaying Date by weekday name
2.40.17.Printing out weekday names
2.40.18.Determine the day of the week