/**
 * Uses a calendar object to figure out about tomorrow 
 * and print out the date and day of the week.
 * This versions tells the calendar object to figure
 * out what day tomorrow is using the add() method.
 */

import java.util.*;

public class bettertomorrow {

    /**
     *  define an array of strings that can translate between integer
     *  DAY_OF_WEEK and strings. Sunday is the first day of the week for
     *  the GregorianCalendar (although this can be changed).
     *  Note: The DAY_OF_WEEK value used by Calendar objects start at 1, 
     * (and our array of strings starts at 0)!
     */
 
    final static String[] DAYS ={ "Sunday",
				  "Monday",
				  "Tuesday",
				  "Wednesday",
				  "Thursday",
				  "Friday",
				  "Saturday" };

    /**
     *  define an array of strings that can translate between integer
     *  MONTH and strings. According to a Calendar object, the first
     *  month (January) is month 0.
     */

    static final String[] MONTHS = { "January",
				     "February",
				     "March",
				     "April",
				     "May",
				     "June",
				     "July",
				     "August",
				     "September",
				     "October",
				     "November",
				     "December"};

    /**
     * main can handle a month day and year specified on the command
     * line (all as integers). If it find acceptable values on the
     * command line this program uses today's date.
     *
     * main figures out the date for the following day, and prints it out.
     */

    static public void main(String []args) {
	// Create a calendar object holding today's date
	Calendar c = Calendar.getInstance();
	// if there are command line args, change the Calendar 
	// object to hold the date specified by the month,day and year
	try {
	    int month,day,year;
	    month = Integer.parseInt(args[0]);
	    day = Integer.parseInt(args[1]);
	    year = Integer.parseInt(args[2]);

	    // January is month 0 !
	    c.set(Calendar.MONTH,month-1);
	    c.set(Calendar.YEAR,year);
	    c.set(Calendar.DATE,day);
	} catch( Exception e) {
	    // invalid or missing command line args, just
	    // assume we should use the current month,year.
	    // This is already in the Calendar object!
	} 

	// Instead of looking at the current day,month to determine whether
	// tomorrow is a new month/year - just add 1 to the day to get to tomorrow!
	
	c.add(Calendar.DATE,1);

	// the Calendar object now has all the date fields set to
	// represent tomorrow. Print this day out.

	System.out.println("Tomorrow is " + 
			   dayName(c) + " " + 
			   monthName(c) + " " +
			   c.get(Calendar.DATE) + ", " +
			   c.get(Calendar.YEAR));
    }	

    /**
     * daysInMonth looks up the number of days in the current month
     * in a Calendar object. This takes care of leap year for us!
     * @param c is the Calendar object holding the date we want to
     *          find out about.
     * @return the number of days in the month. 
     */
    static int daysInMonth( Calendar c) {
	return(c.getActualMaximum(Calendar.DAY_OF_MONTH));
    }


    /**
     * dayName looks up the string version of the day of the week
     * for the date in a Calendar object
     * @param c the Calendar object holding the date
     * @return an string holding the (english) day of the week
     */

    static String dayName( Calendar c) {
	// Need to subtract 1, since the first DAY_OF_WEEK is 1 !
	return(DAYS[c.get(Calendar.DAY_OF_WEEK)-1]);
    }	

    /**
     * monthName looks up the string version of the month
     * for the date in a Calendar object
     * @param c the Calendar object holding the date
     * @return an string holding the (english) month
     */

    static String monthName(Calendar c) {
	return(MONTHS[c.get(Calendar.MONTH)]);
    }
  

}