这是许多语言（包括Java ）的链接。这是相关的摘录：
public class RN { enum Numeral { I(1), IV(4), V(5), IX(9), X(10), XL(40), L(50), XC(90), C(100), CD(400), D(500), CM(900), M(1000); int weight; Numeral(int weight) { this.weight = weight; } }; public static String roman(long n) { if( n <= 0) { throw new IllegalArgumentException(); } StringBuilder buf = new StringBuilder(); final Numeral[] values = Numeral.values(); for (int i = values.length - 1; i >= 0; i--) { while (n >= values[i].weight) { buf.append(values[i]); n -= values[i].weight; } } return buf.toString(); } public static void test(long n) { System.out.println(n + " = " + roman(n)); } public static void main(String[] args) { test(1999); test(25); test(944); test(0); }}
