// Get three values for:
int day = 0;
int month = 0;
int year = 0;
String line = null;
BufferedReader is = new BufferedReader( new InputStreamReader( System.in ) );
System.out.print( "Enter birthday ( day month year ) : " );
while( true )
{ try
{ line = is.readLine();
StringTokenizer st = new StringTokenizer( line );
String item = st.nextToken();
day = new Integer( item.trim() ).intValue();
item = st.nextToken();
month = new Integer( item.trim() ).intValue() - 1; // month !!
item = st.nextToken();
year = new Integer( item.trim() ).intValue();
if( year < 100 ) // this century
{ year += 1900;
}
break;
}
catch( IOException ioe )
{ // real bother
System.exit( -1 );
}
catch( Exception e ) // others
{ System.out.println( "Illegal format - do again" );
}
}
// Assert: day, month, year are all set to int values but they do
// not neccesarily consitute a vaild date!
// Set up a calendar object for the birthday
Calendar birthday = new GregorianCalendar( year, month, day, 0, 0, 0 );
// hr, min, sec = 0
// For output we need a formatter
// The default one for our locale first:
SimpleDateFormat format1 = new SimpleDateFormat();
// and one set to Day name, date, Month name and year in full
SimpleDateFormat format2 = new SimpleDateFormat( "EEEE d MMMM yyyy" );
// output using the formatters
// Note: the calendar returns date and time together as a Date object
System.out.println( "You were born on : " + format1.format( birthday.getTime() ) );
System.out.println( "or : " + format2.format( birthday.getTime() ) );
// Set up a calendar for the current date and time
Calendar now = new GregorianCalendar();
// Now to work out the age in years
int ageInYears = now.get( Calendar.YEAR ) - birthday.get( Calendar.YEAR );
// and adjust according exactly when the birthday falls
// Calendar.DAY_OF_YEAR looks useful but leap years complicate its use, so...
if( now.get( Calendar.MONTH ) < birthday.get( Calendar.MONTH ) )
{ ageInYears -= 1;
}
else if( (now.get( Calendar.MONTH ) == birthday.get( Calendar.MONTH ))
& (now.get( Calendar.DAY_OF_MONTH ) < birthday.get( Calendar.DAY_OF_MONTH )) )
{ ageInYears -= 1;
}
else if( (now.get( Calendar.MONTH ) == birthday.get( Calendar.MONTH ))
& (now.get( Calendar.DAY_OF_MONTH ) == birthday.get( Calendar.DAY_OF_MONTH )) )
{ System.out.print( "Happy Birthday! " );
}
System.out.println( "You are " + ageInYears + " years old." );
// Phew!
