public static void main(String[] args) { int month = calendar.get(MyCalendar.MONTH) + 1; int year = calendar.get(MyCalendar.YEAR); if (args.length > 2) System.out.println("Usage java Exercise14_10 month year"); else if (args.length == 2) { // use user-defined month and year year = Integer.parseInt(args[1]); month = Integer.parseInt(args[0]); calendar.set(Calendar.YEAR, year); calendar.set(Calendar.MONTH, month - 1); } else if (args.length == 1) { // use user-defined month for the current year month = Integer.parseInt(args[0]); calendar.set(Calendar.MONTH, month - 1); } // set date to the first day in a month calendar.set(Calendar.DATE, 1); // print calendar for the month printMonth(year, month); }