NumberUtils.java

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package org.arkhamnetwork.arcade.commons.utils;

/**
 *
 * @author devan_000
 */
public class NumberUtils {

    public static String integerToRomanNumeral(int input) {
        if (input < 1 || input > 3999) {
            return "Invalid Roman Number Value";
        }
        String s = "";
        while (input >= 1000) {
            s += "M";
            input -= 1000;
        }
        while (input >= 900) {
            s += "CM";
            input -= 900;
        }
        while (input >= 500) {
            s += "D";
            input -= 500;
        }
        while (input >= 400) {
            s += "CD";
            input -= 400;
        }
        while (input >= 100) {
            s += "C";
            input -= 100;
        }
        while (input >= 90) {
            s += "XC";
            input -= 90;
        }
        while (input >= 50) {
            s += "L";
            input -= 50;
        }
        while (input >= 40) {
            s += "XL";
            input -= 40;
        }
        while (input >= 10) {
            s += "X";
            input -= 10;
        }
        while (input >= 9) {
            s += "IX";
            input -= 9;
        }
        while (input >= 5) {
            s += "V";
            input -= 5;
        }
        while (input >= 4) {
            s += "IV";
            input -= 4;
        }
        while (input >= 1) {
            s += "I";
            input -= 1;
        }
        return s;
    }

}