Java from int to roman numeral

Derp.java

    private static String[] RVALS = {"M", "CM", "D", "CD", "C", "XC", "L",
                                     "XL", "X", "IX", "V", "IV", "I"};
    
    private static int[] IVALS = {1000, 900, 500, 400, 100, 90,
                                  50, 40, 10, 9, 5, 4, 1};

    public static String toRomanNumeral(int value) {
        if (value >= 4000 || value <= 0) return "";
        String roman = "";
        for (int i = 0; i < RVALS.length; i++) {
            while (value >= IVALS[i]) {
                roman += RVALS[i];
                value -= IVALS[i];
            }
        }
        return roman;
    }