Program to convert integers to roman and vice versa

RomanNumerals.java

import java.util.HashMap;
import java.util.Map;

public class RomanNumbers {

    public static void main(String[] args) {
        for (int i = 1; i <= 50; i++) {
            String roman = intToRoman(i);
            System.out.println(roman + " = " + romanToInt(roman));
        }
    }

    public static String intToRoman(int num) {
        StringBuilder result = new StringBuilder();
        String[][] romanNumerals = {{"", "M", "MM", "MMM"},
                {"", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"},
                {"", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"},
                {"", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"}};

        int[] romanInt = new int[]{1000, 100, 10, 1};
        for (int i = 0; i < romanInt.length; i++) {
            result.append(romanNumerals[i][num / romanInt[i]]);
            num = num % romanInt[i];
        }
        return result.toString();
    }

    public static int romanToInt(String romanNum) {
        int result = 0;
        Map<Character, Integer> romanToIntMap = new HashMap<>();
        romanToIntMap.put('M', 1000);
        romanToIntMap.put('D', 500);
        romanToIntMap.put('C', 100);
        romanToIntMap.put('L', 50);
        romanToIntMap.put('X', 10);
        romanToIntMap.put('V', 5);
        romanToIntMap.put('I', 1);
        for(int i = 0; i < romanNum.length(); i++) {
            int currentVal = romanToIntMap.get(romanNum.charAt(i));
            if(i < romanNum.length() - 1) {
                int nextVal = romanToIntMap.get(romanNum.charAt(i + 1));
                if(currentVal < nextVal) {
                    result += nextVal - currentVal;
                    i++;
                } else {
                    result += currentVal;
                }
            } else {
                result += currentVal;
            }
        }

        return result;
    }
}