//  BirthdaysGregorianCalendar.java  (c) 2005 Kari Laitinen

//  http://www.naturalprogramming.com

//  2004-08-19  Java file created.
//  2005-06-20  Last modification.

//  By default, the Scanner object referenced by keyboard
//  uses whitespace characters (e.g. spaces and line termination
//  characters) as delimiters where data input operations stop.
//  In this program we need to use the - character as a delimiter
//  when the user types in the date in the format YYYY-MM-DD.

//  The regular expression [-\\s] specifies the delimiters which
//  the nextInt() methdod recognizes when it is reading the data
//  from the keyboard. [-\\s] specifies two delimiters. - means that
//  the hyphen sign is a delimiter. \\s is interpreted after compilation
//  as \s and it means any whitespace character.

import java.util.* ;

class BirthdaysGregorianCalendar
{
   public static void main( String[] not_in_use )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      System.out.print( "\n Type in your date of birth as YYYY-MM-DD"
                     +  "\n Please, use four digits for the year:  " ) ; 

      keyboard.useDelimiter( "[-\\s]" ) ;

      int  year_of_birth   =  keyboard.nextInt() ;
      int  month_of_birth  =  keyboard.nextInt() ;
      int  day_of_birth    =  keyboard.nextInt() ;

      Calendar date_of_birth  =  new  GregorianCalendar(
                    year_of_birth, month_of_birth - 1, day_of_birth ) ;

      System.out.printf( "\n   You were born on a %tA",  date_of_birth ) ;
      System.out.print(  "\n   Here are your days to celebrate. You are\n" ) ;

      int  years_to_celebrate  =  10 ;

      while ( years_to_celebrate  <  80 )
      {
         Calendar  date_to_celebrate  =  new  GregorianCalendar(

                      year_of_birth  +  years_to_celebrate,
                      month_of_birth  -  1,
                      day_of_birth ) ;

         System.out.printf( "\n   %1$d years old on %2$tF (%2$tA)",
                            years_to_celebrate,
                            date_to_celebrate  ) ;

         years_to_celebrate  =  years_to_celebrate  +  10 ;
      }
   }
}

/******
      First I wrote the beginning of this program in the
      following way:


      String  date_of_birth_as_string  =  keyboard.nextLine() ;

      Scanner text_to_scan = new Scanner( date_of_birth_as_string ) ;
      text_to_scan.useDelimiter( "-" ) ;

      int  year_of_birth   =  text_to_scan.nextInt() ;
      int  month_of_birth  =  text_to_scan.nextInt() ;

      int  day_of_birth    =  text_to_scan.nextInt() ;

*****/