Working with Roman Numerals
You need to format numbers as Roman numerals. Perhaps you’ve just written the next Titanic or Star Wars episode and you need to get the copyright date correct. Or, on a more mundane level, you need to format page numbers in the front matter of a book.
// RomanNumberSimple.java RomanNumberFormat nf = new RomanNumberFormat( ); int year = Calendar.getInstance( ).get(Calendar.YEAR); System.out.println(year + " -> " + nf.format(year));
The use of
Calendar to get the current year is
explained in Section 6.2. Running
RomanNumberSimple looks like this:
+ jikes +E -d . RomanNumberSimple.java + java RomanNumberSimple 2000 -> MM
There is nothing in the standard API to format Roman numerals.
class is designed to be subclassed for
precisely such unanticipated purposes, so I have done just that and
developed a class to format numbers as Roman numerals. Here is a
better and complete example program of using it to format the current
year. I can pass a number of arguments on the command line, including
"-" where I want the year to appear (note that
these arguments are normally not quoted; the
must be an argument all by itself, just to keep the program simple).
I use it as follows:
$ java RomanYear Copyright (c) - Ian Darwin Copyright (c) MMI Ian Darwin $
The code for the
program is simple, yet it
correctly gets spaces around the arguments.
import java.util.*; /** ...