7. GregorianCalendar examples

• Code that changes a GregorianCalendar object

  
  GregorianCalendar endDate = new 
     GregorianCalendar(2010, 0, 1);      // January 1, 2010
  endDate.set(2010, 2, 30);              // March 30, 2010
  endDate.set(2010, Calendar.MARCH, 30); // March 30, 2010
  endDate.set(Calendar.MONTH, Calendar.JANUARY);
                                         // January 30, 2010
  endDate.add(Calendar.MONTH, 5);        // June 30, 2010
  endDate.add(Calendar.MONTH, 14);       // August 30, 2011
  endDate.roll(Calendar.MONTH, 14);      // October 30, 2011
  endDate.roll(Calendar.MONTH, true);    // November 30, 2011: +1 tick
  endDate.roll(Calendar.DAY_OF_MONTH, false);
                                         // November 29, 2011: -1 tick